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Questions and Answers
A student traces a ray of light through a rectangular glass slab. Which pair of angles must they mark correctly to verify the laws of refraction?
A student traces a ray of light through a rectangular glass slab. Which pair of angles must they mark correctly to verify the laws of refraction?
- Angle of incidence and angle of emergence (correct)
- Angle of incidence and angle of reflection
- Angle of refraction and angle of emergence
- Angle of incidence and angle of refraction
To obtain a sharp image of a distant object using a concave mirror, a student initially focuses on a window grill. What adjustment should the student make to focus on a more distant object?
To obtain a sharp image of a distant object using a concave mirror, a student initially focuses on a window grill. What adjustment should the student make to focus on a more distant object?
- Move the screen and the mirror towards the object.
- Move the mirror slightly towards the screen.
- Move the screen slightly away from the mirror.
- Move the screen and the mirror away from the object. (correct)
In an experiment with a convex lens, a student observes a sharp image of a distant window grill. To focus on a tree much farther away, how should the lens be moved?
In an experiment with a convex lens, a student observes a sharp image of a distant window grill. To focus on a tree much farther away, how should the lens be moved?
- Towards the screen (correct)
- Very far away from the screen
- Behind the screen
- Away from the screen
A student uses a concave mirror to project a sharp image of a window grill onto a screen. The teacher suggests focusing on the sun for better results. What should the student do to achieve this?
A student uses a concave mirror to project a sharp image of a window grill onto a screen. The teacher suggests focusing on the sun for better results. What should the student do to achieve this?
A student plots the path of a light ray through a glass slab and marks the angles of incidence $i$, refraction $r$, and emergence $e$. Which of the following statements regarding the marked angles is correct if there are errors?
A student plots the path of a light ray through a glass slab and marks the angles of incidence $i$, refraction $r$, and emergence $e$. Which of the following statements regarding the marked angles is correct if there are errors?
What distance must an object be placed from a convex lens with a focal length of 10 cm for its image to form 20 cm from the lens?
What distance must an object be placed from a convex lens with a focal length of 10 cm for its image to form 20 cm from the lens?
To find the focal length of a concave mirror, what apparatus should Sita select?
To find the focal length of a concave mirror, what apparatus should Sita select?
A 4 cm tall object is placed on the principal axis of a convex lens. The object is 12 cm from the lens, and the sharp image appears 24 cm away on the other side. If the object is moved further from the lens, what adjustments are needed to recover a clearer image?
A 4 cm tall object is placed on the principal axis of a convex lens. The object is 12 cm from the lens, and the sharp image appears 24 cm away on the other side. If the object is moved further from the lens, what adjustments are needed to recover a clearer image?
A student learns that a converging lens can produce both magnified and diminished images. Which best describes the setup?
A student learns that a converging lens can produce both magnified and diminished images. Which best describes the setup?
An illuminated object's image is formed on a screen using device 'X', with 'S' denoting the screen's position as illustrated. 'X' and 'S' are separated by 40 cm. Select the appropriate statement for 'X'
An illuminated object's image is formed on a screen using device 'X', with 'S' denoting the screen's position as illustrated. 'X' and 'S' are separated by 40 cm. Select the appropriate statement for 'X'
If a lens brings parallel sun rays together at a point 20 cm from its center, what is the lens's power?
If a lens brings parallel sun rays together at a point 20 cm from its center, what is the lens's power?
Given the refractive indices $n_1$, $n_2$, and $n_3$ for three media as illustrated, which relationship holds true among them?
Given the refractive indices $n_1$, $n_2$, and $n_3$ for three media as illustrated, which relationship holds true among them?
Assuming a converging mirror has a radius of curvature of 30 cm, where should an object be positioned to produce a virtual image?
Assuming a converging mirror has a radius of curvature of 30 cm, where should an object be positioned to produce a virtual image?
Suppose a converging lens creates an image that is three times larger and projected onto a screen. If the lens has a focal length of 30 cm, how far is the object from the lens?
Suppose a converging lens creates an image that is three times larger and projected onto a screen. If the lens has a focal length of 30 cm, how far is the object from the lens?
If an object is placed within the focus of a converging lens, what type of image will be formed?
If an object is placed within the focus of a converging lens, what type of image will be formed?
A ray of light moves from air into medium A (refractive index 1.50), then into medium B (refractive index 1.33), and finally into medium C (refractive index 2.42). It exits medium C back into air. Bending is smallest for:
A ray of light moves from air into medium A (refractive index 1.50), then into medium B (refractive index 1.33), and finally into medium C (refractive index 2.42). It exits medium C back into air. Bending is smallest for:
A student obtains an image of a distant object on a screen to find the focal length of a spherical mirror, 'F'. Given another mirror with focal length $F_2$ they find that they need to move the mirror away from the screen to get the object in focus. Select their conclusion.
A student obtains an image of a distant object on a screen to find the focal length of a spherical mirror, 'F'. Given another mirror with focal length $F_2$ they find that they need to move the mirror away from the screen to get the object in focus. Select their conclusion.
Given a diagram, where an object is placed beyond $2F$ of a convex lens, and a real, inverted image is formed, what is the sign and specification of the new cartesian image?
Given a diagram, where an object is placed beyond $2F$ of a convex lens, and a real, inverted image is formed, what is the sign and specification of the new cartesian image?
A student traces light through a prism, finding different angles of incidence. What describes the emergent ray?
A student traces light through a prism, finding different angles of incidence. What describes the emergent ray?
Flashcards
Ray diagram
Ray diagram
A diagram showing the formation of the image of an object with the help of suitable rays.
Focal length setup
Focal length setup
To determine focal length of a concave mirror, choose a mirror holder, a screen holder, and a scale.
Focusing with lens
Focusing with lens
When using a convex lens, move the lens away from the screen to focus on a distant object.
Focal length determination steps
Focal length determination steps
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Concave mirror focal length
Concave mirror focal length
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Device X statement
Device X statement
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Emergent ray
Emergent ray
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Laws of reflection
Laws of reflection
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Concave mirror image
Concave mirror image
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Convex lens rays
Convex lens rays
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Bending of light
Bending of light
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Solar cooker
Solar cooker
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Virtual image distance
Virtual image distance
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Refractive Index of a Medium
Refractive Index of a Medium
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Water optically denser?
Water optically denser?
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Study Notes
Light: Reflection and Refraction
- Draw a diagram to show image formation of an object AB using suitable rays [2008]
- Draw the path of light beyond the lens (diagram provided) [2009]
- Explain why a ray of light bends when traveling from one medium to another [2009]
- Explain why a ray of light passing through the center of curvature of a concave mirror is reflected along the same path [2010]
- Describe the nature of the image formed by a concave mirror if the magnification is +3. [2010]
- Describe for a ray of light passing through a glass slab, how the lateral displacement was correctly measured [2011]
- Sita should choose a mirror holder, screen holder, and scale to find the focal length of a concave mirror [2011]
- To focus a distant tree instead of the grill using a convex lens, the student should move the lens away from the screen [2011, 2016, 2017]
- The steps to determine the focal length of a convex lens by obtaining a sharp image of a distant object includes the sequence: III (Select a suitable distant object), I (Hold the lens between the object and the screen), II (Adjust the position of the lens to form a sharp image), IV (Measure the distance between the lens and the screen) [2011, 2012]
- Tabulated observations for the path of a ray of light passing through a rectangular glass slab must show agreement of angles Zi, r, and e. [2012]
- Angles Zi and Ze have not been marked correctly in a rectangular glass slab diagram [2012, 2014]
- Focus on the Sun as a distant lit object as the screen and mirror need to be moved away from the object [2012, 2013]
- Distance between the mirror and screen is measured to determine focal length of concave mirror [2012]
- The device X is a convex lens of focal length 40 cm if the distance of the screen from the device is 40 cm [2013, 2014, 2015, 2017]
- The diagrams II and III only show the correct path of the ray passing through the lens [2013]
- Rays 1, 2, and 3 obey the laws of refraction and may be used for locating the image formed by a convex lens [2013, 2014]
- Diagram I shows the best set-up to trace the path of a ray of light through a rectangular glass slab [2013]
- With a glass prism for different values of angle of incidence, the emergent ray bends at an angle to the direction of the incident ray [2013]
- Moving the mirror away from the screen indicates both spherical mirrors are concave and F1 < F2 [2014]
- Select the correct option for when a student may observe the formed image if placed at a distance of 20 cm from the lens (20 cm on the other side of the lens and is of the same size, real and inverted) [2014]
- Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray of light parallel to the principal axis of a convex mirror, show angle of incidence and angle of reflection on it [2015]
- A student tracing light through a rectangular glass slab is likely to draw the conclusion Zi=Ze>Zr [2015]
- Determine the distances of measurement to determine a focal length [2015]
- To determine the speed of light in water given that the refractive indices of glass and water with respect to air are 3/2 and 4/3, respectively and that the speed of light in glass is 2 x 10^8 m/s [2016]
- What are the position, nature etc. of the image formed when an object is placed at a distance of 15 cm from a concave lens of focal length 30 cm, list four characteristics [2017]
- The laws of reflection from hold true for all reflecting surfaces [2020]
- When an object is kept within the focus of a concave mirror, an enlarged image forms behind the mirror, that is virtual and erect. [2020]
- A solar cooker has a wide concave mirror [2021]
- A correct arrangement shows a concave mirror set up, with object AB placed beyond F, as a well illuminated and magnified image of AB would be visible on the screen [2021]
- A convex lens is likely to be used in the optical device [2021]
- The bending of light is least in medium pair A-B (air-A, A-B, B-C, C-air) [2021]
- In the diagram shown, the magnification of the image formed has Sign = Negative, Value Less than 1 [2021]
- In the diagram (A, B, C are three different transparent media, 1 > 4) [2021]
- The power of the lens is +5D given that the lens can converge the sun rays at a point 20 cm away from its optical centre [2021]
- An object should be placed somewhere between 0 cm and 15 cm to obtain a virtual image with the converging mirror [2021]
- If a converging lens forms a three times magnified image of an object, which can be taken on a screen and which focal length of the lens is 30 cm, then the distance of the object from the lens is -40 cm [2021]
- In reference to the diagram shown, the incorrect statement is image formed is enlarged [2021]
- In the diagram shown above n1, n2 and n3 are refractive indices of the media 1, 2 and 3 respectively (n1>n2) [2021]
- Given the refractive index of medium A is 1.5 and that of medium B is 1.33. When the speed of light in air is 3 x 108 m/s. The speed of light in medium A and B respectively is 2 x 108 m/s and 2.25 x 108 m/s [2021]
- The height of the image formed is +1.0cm given that an object of height 4 cm is kept at a distance of 30 cm from the pole of a diverging mirror and that the focal length of the mirror is 10 cm [2021]
- To determine the types of lenses (L1 and L2) that must be used in the compound microscope Both convex [2021]
- Given that a compound microscope is an instrument which consists of two lenses (L1) and (L2). The value of magnification (according to the new Cartesian sign convention) from L1 is Value More than 1 and Sign Negative [2021]
- Given that a compound microscope is an instrument which consists of two lenses (L1) and (L2). The value of magnification (according to the new Cartesian sign convention) from L2 is Value Less than 1 and Sign Positive [2021]
- 16 cm is the distance an object should be at from the optical center after being a distance of 80 cm from its optical centre given that the power of the eyepiece (L2) is 5 diopters and it forms an image [2021]
- At 2F or between F and the optical center should an object be put as determined by drawing ray diagrams to represent the relation nature, position and relative [2008]
- Two rays required to locate the image formed by a concave mirror for an object and to draw a ray diagram to show the formation of a virtual image made by it [2009]
- To observe any four characteristics of the image of the objects formed by a plane mirror [2011]
- To list four properties of the image formed by a concave mirror while an object is placed between the focus and pole of the mirror [2012]
- A concave mirror can form a magnified, erect/inverted image of an object placed in front of it and to justify this statement stating the positions of the object with respective cases and to obtain the images [2014]
- To draw a ray diagram to find the position and size of the image while marking appropriate labels [2016, 2018] given the placement of an object of height 2.5 cm is placed at a distance
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