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## Optics Review

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
How light propagates through a material is given by the ratio of the speed of light in vacuum to the speed of light in that material. What is this ratio called?
1. reflection ratio
2. ratio of bending
3. light speed index
4. refractive index
2.
When an image is reflected off a concave mirror, how does the image appear to the eye?
1. The image is magnified because a concave mirror is divergent.
2. The image is magnified because a concave mirror is convergent.
3. The image is reduced because a concave mirror is divergent.
4. The image is reduced because a concave mirror is convergent.
3.
An object's reflection in a plane mirror appears to be 30 m away. How far is the real object from the mirror?
1. 60 m
2. 30 m
3. 15 m
4. impossible to determine
4.
Every lens or mirror has a place where all of the parallel rays will meet. This is
known as the                  .
1. normal
2. focal point
3. refraction point
4. convergence point
5.
When an image is reflected off a convex mirror, how does the image appear to the eye?
1. The image is magnified because a convex mirror is divergent.
2. The image is magnified because a convex mirror is convergent.
3. The image is reduced because a convex mirror is divergent.
4. The image is reduced because a convex mirror is convergent.
6.
What occurs when the angle of incidence of a light ray is greater than the critical angle?
1. critical refraction
2. total internal reflection
3. total external reflection
4. dispersion
7.
When light rays pass through a convex lens, as in the image shown, what happens to the rays and the perceived image of the object?
1. The light rays diverge, magnifying the perceived image.
2. The light rays converge, magnifying the perceived image.
3. The light rays diverge, reducing the perceived image.
4. The light rays converge, reducing the perceived image.
8.
When a ray of light passes from air, a less dense medium, to glass, a more dense medium, the ray of light will bend                 the normal.
1. towards
2. away from
9.
What is refraction? Include a real world example as part of your explanation.

10.
If the angle formed by lines c and a has a measure of $84deg$. What is the measure of the angle of incidence?
1. $6deg$
2. $48deg$
3. $96deg$
4. $42deg$
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