Podcast
Questions and Answers
Which of the following best describes the orientation of the center of a convex mirror?
Which of the following best describes the orientation of the center of a convex mirror?
- It bulges away from the viewer.
- It bulges toward the viewer. (correct)
- It is located on the inner surface of the sphere.
- It lies on the reflective surface of the mirror.
The principal axis of a mirror intersects the mirror's surface at a 45-degree angle.
The principal axis of a mirror intersects the mirror's surface at a 45-degree angle.
False (B)
What is the term for the point where light rays parallel to the principal axis converge after reflecting off a concave mirror?
What is the term for the point where light rays parallel to the principal axis converge after reflecting off a concave mirror?
focus
A concave mirror is also known as a ______ mirror because of its ability to bring parallel light rays together.
A concave mirror is also known as a ______ mirror because of its ability to bring parallel light rays together.
Match each type of image with its corresponding description:
Match each type of image with its corresponding description:
What principle explains why a light ray directed through the center of curvature of a concave mirror reflects back upon itself?
What principle explains why a light ray directed through the center of curvature of a concave mirror reflects back upon itself?
If an object is placed at the focus of a concave mirror, a clear and magnified real image will be formed.
If an object is placed at the focus of a concave mirror, a clear and magnified real image will be formed.
What type of mirror is used in car headlights and searchlights to produce a parallel beam of light?
What type of mirror is used in car headlights and searchlights to produce a parallel beam of light?
The Hubble Space Telescope initially produced fuzzy images due to a grinding error in its ______ mirror.
The Hubble Space Telescope initially produced fuzzy images due to a grinding error in its ______ mirror.
Match the object location with the image characteristics formed by a converging (concave) mirror:
Match the object location with the image characteristics formed by a converging (concave) mirror:
Which of the following is a characteristic of the image formed by a convex mirror?
Which of the following is a characteristic of the image formed by a convex mirror?
A diverging mirror converges rays of light.
A diverging mirror converges rays of light.
Why are convex mirrors often used as security mirrors in stores?
Why are convex mirrors often used as security mirrors in stores?
In a convex mirror, the virtual focus is located ______ the mirror.
In a convex mirror, the virtual focus is located ______ the mirror.
Match each type of mirror with its appropriate application:
Match each type of mirror with its appropriate application:
Why does spherical aberration occur in spherical mirrors?
Why does spherical aberration occur in spherical mirrors?
Parabolic mirrors are designed to eliminate spherical aberration.
Parabolic mirrors are designed to eliminate spherical aberration.
What advantage do parabolic mirrors offer over spherical mirrors in applications like solar collectors?
What advantage do parabolic mirrors offer over spherical mirrors in applications like solar collectors?
In a searchlight, if the light source is placed slightly inside the focus of a concave mirror, the reflected rays will ______ slightly apart, illuminating a greater area.
In a searchlight, if the light source is placed slightly inside the focus of a concave mirror, the reflected rays will ______ slightly apart, illuminating a greater area.
Relate different applications to whether concave or convex mirrors are more suitable:
Relate different applications to whether concave or convex mirrors are more suitable:
Consider an object placed between the focal point and a concave mirror. Which statement about the resulting image is true?
Consider an object placed between the focal point and a concave mirror. Which statement about the resulting image is true?
An image located beyond 'C' for a concave mirror will be smaller than the object.
An image located beyond 'C' for a concave mirror will be smaller than the object.
Explain the effect of reversibility of light in the context of concave mirrors.
Explain the effect of reversibility of light in the context of concave mirrors.
A virtual image formed by a concave mirror is always ______ and ______.
A virtual image formed by a concave mirror is always ______ and ______.
Match the type of device with the way it uses mirrors:
Match the type of device with the way it uses mirrors:
What happens to the reflected rays when an object is placed exactly at the focus (F) of a concave mirror?
What happens to the reflected rays when an object is placed exactly at the focus (F) of a concave mirror?
The image formed by a concave mirror when the object is at 'C' will be at 'F'.
The image formed by a concave mirror when the object is at 'C' will be at 'F'.
State the printing frequently found on car side-view mirrors with convex surfaces and explain its significance.
State the printing frequently found on car side-view mirrors with convex surfaces and explain its significance.
For a concave mirror, if the object is beyond F, a ______, ______ real image will be formed.
For a concave mirror, if the object is beyond F, a ______, ______ real image will be formed.
Match the term with its description:
Match the term with its description:
Flashcards
Concave (Converging) Mirror
Concave (Converging) Mirror
A mirror with the inner surface of a sphere as the reflective surface.
Convex (Diverging) Mirror
Convex (Diverging) Mirror
A mirror with the outer surface of a sphere forming the reflective surface.
Center of Curvature (C)
Center of Curvature (C)
The center of the sphere from which the mirror's surface is derived.
Principal Axis
Principal Axis
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Vertex (V)
Vertex (V)
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Focus (F)
Focus (F)
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Converge
Converge
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Real Image
Real Image
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Diverging Mirror
Diverging Mirror
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Diverge
Diverge
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Study Notes
Curved Mirrors
- Curved mirrors are created by making part of a sphere's surface reflective
- Concave mirrors reflect from the inner surface, bulging away from you
- Convex mirrors reflect from the outer surface, bulging toward you
Terminology of Concave Mirrors
- The centre of curvature (C) is the centre of the sphere whose surface forms the mirror
- The principal axis runs through the centre of curvature to the middle of the mirror
- The principal axis intersects the mirror at 90 degrees and is normal to the surface
- The Vertex (V) is where the principal axis meets the mirror
- The focus (F) is the point where light rays parallel to the principal axis converge after reflection
- Concave mirrors are also called converging mirrors because they focus parallel rays at F
Locating Images in Concave Mirrors
- You need at least two incident rays from the top of the object to determine the image
- A light ray parallel to the principal axis is reflected through the focus
- A light ray through the center of curvature is reflected back onto itself
- A ray through F will reflect parallel to the principal axis
- A ray aimed at the vertex will follow the law of reflection
Characteristics of Images at Variety of Object Locations
- If the object is further than C
- The image is smaller and inverted
- The image is between C & F
- The image is considered real
- If the object is at C
- The image is the same size and inverted
- The image is considered real
- If the object is between C & F
- The image is larger and inverted
- The image is outside C
- The image is considered real
- Mirrors were originally developed from a spherical surface
- Using a parabolic surface corrects spherical aberration
Images in a Converging Mirror
- You can locate an image by moving a paper screen back and forth in front of the mirror
- A real image can be formed on a screen
- If the object were beyond C, at C, or between C and F, the reflected rays meet in front of the mirror
- This forms an inverted, real image each time
- Car headlights, flashlights and searchlights use properties of concave mirrors
- Searchlights have the light source at focus with reflected rays forming a parallel beam
- Car headlights and flashlights have the filament slightly inside the focus
Image if object is at F
- No real image is produced because the reflected rays are parallel
- No image will form
Image if object is between F and the Mirror
- No real image is produced because the reflected rays spread apart, or diverge
- The human brain extrapolates the diverging rays backwards to where they appear to originate
- This results in a larger and upright virtual image
Properties of a Converging Mirror
| Location | Size | Attitude | Location | Type |
|---|---|---|---|---|
| beyond C | smaller | inverted | between C and F | real |
| at C | same size | inverted | at C | real |
| between C and F | larger | inverted | beyond C | real |
| at F | no clear image | |||
| inside F | larger | upright | behind mirror | virtual |
How to Locate Image in a Diverging Mirror
- Parts of convex mirror and imaging rules are similar those for a concave mirror:
- F (now called virtual focus) and C are behind the mirror
- Light rays coming from an apparent light source behind the mirror
Images in a Diverging Mirror
- Rays reflected off a convex mirror always diverge
- Reflected rays from an object never cross in front of the mirror to form a real image
- Brain extrapolates these rays behind the mirror to where they appear to converge
- This results in a diverging mirror producing smaller upright virtual image
- Commonly used as security mirrors and side-view mirrors
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