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Questions and Answers
What is the process called when a mirror reverses left and right?
What is the process called when a mirror reverses left and right?
Which type of mirror is commonly found in households for personal grooming?
Which type of mirror is commonly found in households for personal grooming?
What happens to the number of images formed when two plane mirrors are placed at an angle to each other?
What happens to the number of images formed when two plane mirrors are placed at an angle to each other?
What is the primary qualitative characteristic of images determined by mirrors?
What is the primary qualitative characteristic of images determined by mirrors?
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Which type of mirror would produce a smaller virtual image when the object is placed close to it?
Which type of mirror would produce a smaller virtual image when the object is placed close to it?
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What do ray diagramming techniques help to illustrate in optics?
What do ray diagramming techniques help to illustrate in optics?
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What type of mirror is used to focus light and can create an inverted image of an object?
What type of mirror is used to focus light and can create an inverted image of an object?
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What purpose does a mirror serve in terms of light interaction?
What purpose does a mirror serve in terms of light interaction?
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Which statement about the images formed by plane mirrors is NOT true?
Which statement about the images formed by plane mirrors is NOT true?
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What is the speed of light?
What is the speed of light?
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What is the angle of incidence equal to?
What is the angle of incidence equal to?
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Which instrument is used to measure angles in this activity?
Which instrument is used to measure angles in this activity?
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What type of mirror has a flat reflective surface?
What type of mirror has a flat reflective surface?
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What should be marked to indicate the path of light after reflection in the activity?
What should be marked to indicate the path of light after reflection in the activity?
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How is the normal line defined in this activity?
How is the normal line defined in this activity?
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What happens when light is transmitted through an object?
What happens when light is transmitted through an object?
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What is the primary characteristic of convex mirrors?
What is the primary characteristic of convex mirrors?
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How is a real image formed?
How is a real image formed?
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What distinguishes a virtual image from a real image?
What distinguishes a virtual image from a real image?
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Which point is NOT considered in locating the image formed by curved mirrors?
Which point is NOT considered in locating the image formed by curved mirrors?
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What does the focal length of a concave mirror represent?
What does the focal length of a concave mirror represent?
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Which of the following statements is true about images formed by convex mirrors?
Which of the following statements is true about images formed by convex mirrors?
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What is the role of the principal axis in curved mirrors?
What is the role of the principal axis in curved mirrors?
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Which of the following best describes the image produced by a plane mirror?
Which of the following best describes the image produced by a plane mirror?
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Which type of image is always upright?
Which type of image is always upright?
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What type of mirror forms images that can only be virtual?
What type of mirror forms images that can only be virtual?
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Which type of lens is known to correct nearsightedness?
Which type of lens is known to correct nearsightedness?
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Which type of image is formed by rays of light that converge and pass through the image?
Which type of image is formed by rays of light that converge and pass through the image?
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What type of mirror is flat and smooth?
What type of mirror is flat and smooth?
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Which type of image can be larger, smaller, or the same size as the object?
Which type of image can be larger, smaller, or the same size as the object?
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What type of lens is thicker at the center compared to its edges?
What type of lens is thicker at the center compared to its edges?
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Which type of mirror forms images that are always reduced in size?
Which type of mirror forms images that are always reduced in size?
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What term describes an image formed by the actual intersection of light rays?
What term describes an image formed by the actual intersection of light rays?
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Which statement accurately describes the characteristics of images formed by a plane mirror?
Which statement accurately describes the characteristics of images formed by a plane mirror?
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What does the law of reflection state about the angles of incidence and reflection?
What does the law of reflection state about the angles of incidence and reflection?
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What type of reflection occurs when light reflects off a smooth surface?
What type of reflection occurs when light reflects off a smooth surface?
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How does a plane mirror create left-right reversal in an image?
How does a plane mirror create left-right reversal in an image?
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Which factor differentiates specular reflection from diffused reflection?
Which factor differentiates specular reflection from diffused reflection?
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What is the phenomenon called when a ray of light changes direction at the boundary between two media?
What is the phenomenon called when a ray of light changes direction at the boundary between two media?
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What is true about the distance of the image from a plane mirror compared to the object?
What is true about the distance of the image from a plane mirror compared to the object?
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Study Notes
Qualitative Characteristics of Images
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Competencies:
- Predict qualitative characteristics (orientation, type, magnification) of images formed by plane and curved mirrors/lenses.
- Apply ray diagramming techniques to describe image characteristics and positions.
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Intended Learning Outcomes:
- Identify properties of images formed by plane, concave, and convex mirrors.
- Discuss qualitative characteristics of images formed by plane and curved mirrors/lenses.
- Illustrate image formation from plane, concave, and convex mirrors using ray diagrams.
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Overview (Mirrors):
- Mirrors are part of daily routines, commonly used in households for personal appearance checks.
- Plane mirrors produce a single image, multiple images are possible with multiple plane mirrors at angles, akin to a kaleidoscope.
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Activity 1 ("You've Got a Message in a Mirror"):
- Students are to decipher a message written backward/flipped using a mirror.
- This activity demonstrates lateral inversion (right-left reversal) of images in mirrors.
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Review:
- The activity demonstrates lateral inversion in images.
- Review of properties of images formed by mirrors and lenses from prior modules.
- The concept of lateral inversion was a module topic.
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Ambulance Example:
- The word "AMBULANCE" is written backward/flipped on ambulances to appear correctly in the rearview mirror of others. Example of how lateral inversion works in real-life applications.
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Review (Mirrors):
- Mirrors are reflective surfaces (often glass coated with metals).
- Light striking a mirror's surface reflects, creating a visual representation or projection.
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Activity 2 ("Light as Rays"):
- Materials: Plane mirror, laser pointers, protractor.
- Procedure to measure angles of incidence and reflection.
- Place mirror on a line.
- Point laser along incident ray line.
- Mark reflected ray.
- Measure angles between normal line (perpendicular to the surface) and incident/reflected rays.
- Complete a table measuring angles.
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Activity 3 - Fill In The Blanks:
- Light Speed: 3 x 10⁸ m/s
- Reflection: Occurs when light bounces off an object.
- Plane Mirror: A mirror with a flat reflective surface.
- Angle of Incidence = Angle of Reflection
- Real image: formed where light rays actually intersect after reflection; can be projected onto a screen.
- Virtual image: formed where light rays appear to converge; cannot be projected onto a screen.
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Reflection of Light in Mirrors:
- Law of Reflection:
- The incident ray, the reflected ray, and the normal line lie in the same plane.
- The angle of incidence equals the angle of reflection.
- Law of Reflection:
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Reflection in Plane Mirrors:
- Light strikes an object, reflecting in all directions.
- Reflected light reaching the eyes allows seeing the object.
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Characteristics of Plane Mirror Images:
- Image is virtual.
- Same size as the object.
- Same orientation as the object.
- Same distance from the mirror as the object.
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Types of Reflection of Light:
- Specular Reflection: Defined as light reflecting off a smooth surface at a specific angle.
- Diffused Reflection: Produced by a rough surface, where light reflects in multiple directions.
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Mirror Left-Right Reversal:
- Viewing yourself in a plane mirror results in an apparent left-right reversal of the image.
- Raising a hand, the image will appear to raise the opposite (other) hand.
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Mirror Left-Right Reversal (Ambulance example):
- Information is written laterally/inverted to appear correctly in a rear-view mirror.
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Reflection on Spherical Mirrors:
- Convex Mirrors: Diverging mirrors (reflecting surface curves outward). Reflection is outwards, cannot be focused.
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Reflecting Surfaces (Real/Virtual Images):
- Real Image: Light rays actually converge to form the image. Can be projected onto a screen. Real Images are inverted.
- Virtual Image: Light rays appear to diverge from an apparent intersection point. Cannot be projected onto a screen. Virtual images are upright .
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Ray Diagram Formation by Plane Mirror:
- A plane mirror creates an image behind the mirror.
- Images are formed when reflected rays from a point meet (or seem to meet) at a single point.
- Characteristics of images include location, orientation, size. Images are virtual, upright, and same size.
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Image Formed by Curved Mirrors:
- Parts: Aperture, Radius of Curvature, Center of Curvature, Pole, Focal Point, Principal Axis and Focal length
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Image Formed by Concave Mirrors:
- Location of object affects image size and orientation.
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Image Formed by Convex Mirrors:
- Image is always virtual, reduced, and upright. Location of object doesn't affect image size or orientation.
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Difference Between Convex and Concave Lenses:
- Convex lens: Converges light rays
- Concave lens: Diverges light rays
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Seatwork (Multiple questions about characteristics of images and lenses):
- Questions to identify image properties (real/virtual, upright/inverted, etc.).
- Questions to identify mirror/lens type (plane, concave, convex).
- Questions on lens focal length and its use in correcting nearsightedness/farsightedness.
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Description
Explore the qualitative characteristics of images formed by mirrors and lenses, including orientation, type, and magnification. This quiz will test your understanding of properties, ray diagramming techniques, and the effects of concave and convex mirrors. Dive into practical activities that illustrate these concepts in real-world contexts.
