# Unit 13 Review

Reflection and Refraction

 Navigate to Answers for: [ Questions #1-#12 | Questions #13-#24 | Questions #25-#36 | Questions #37-#49 ]  [ #13 | #14 | #15 | #16 | #17 | #18 | #19 | #20 | #21 | #22 | #23 | #24 ]

13. Use of a parabolic mirror, instead of one made of a circular arc surface, can be used to reduce the occurrence of which of the following effects?

 a. spherical aberration b. mirages c. chromatic aberration d. light scattering

Spherical Aberration (6 seconds)

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14. When the image of an object is seen in a plane mirror, the image is

 a. real and upright. b. real and inverted. c. virtual and upright. d. virtual and inverted.

Image Characteristics for Plane Mirrors (6 seconds)

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15. When the image of an object is seen in a plane mirror, the distance from the mirror to the image depends on

1. the wavelength of light used for viewing.
2. the distance from the object to the mirror.
3. the distance of both the observer and the object to the mirror.

Image Characteristics for Plane Mirrors (6 seconds) | Ray Diagrams for Plane Mirrors (11 seconds)

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16. If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror

1. is equal to the height of the man.
2. is equal to one half the height of the man.
3. depends on the distance the man stands from the mirror.
4. depends on both the height of the man and the distance from the man to the mirror.

What Portion of a Mirror is Required to View an Image? (7 seconds)

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17. When the image of an object is seen in a concave mirror the image will

 a. always be real. b. always be virtual. c. be either real or virtual. d. will always be magnified.

Image Characteristics for Concave Mirrors (9 seconds)

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18. When the image of an object is seen in a convex mirror the image will

 a. always be real. b. always be virtual. c. may be either real or virtual. d. will always be magnified.

Image Characteristics for Convex Mirrors (7 seconds)

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19. Rays of light traveling parallel to the principal axis of a concave mirror will come together

 a. at the center of curvature. b. at the focal point. c. at infinity. d. at a point half way to the focal point.

Reflection of Light and Image Formation (6 seconds)

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20. If carbon tetrachloride has an index of refraction of 1.461, what is the speed of light through this liquid? (c = 3 x 10^8 m/s)

 a. 4.38 x 10^8 m/s b. 2.05 x 10^8 m/s c. 4.461 x 10^8 m/s d. 1.461 x 10^8 m/s

Optical Density and Light Speed (13 seconds)

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21. A ray of light in air is incident on an air-to-glass boundary at an angle of 30 degrees with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal?

 a. 56 degrees b. 46 degrees c. 30 degrees d. 18 degrees

Snell's Law (10 seconds) | Ray Tracing and Problem-Solving (15 seconds)

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22. If the critical angle for internal reflection inside a certain transparent material is found to be 48 degrees, what is the index of refraction of the material? (Air is outside the material).

 a. 1.35 b. 1.48 c. 1.49 d. 0.743

The Critical Angle (10 seconds)

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23. Carbon disulfide (n = 1.63) is poured into a container made of crown glass (n = 1.52). What is the critical angle for internal reflection of a ray in the liquid when it is incident on the liquid-to-glass surface?

 a. 89 degrees b. 69 degrees c. 21 degrees d. 4.0 degrees

The Critical Angle (10 seconds)

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24. Carbon tetrachloride (n = 1.46) is poured into a container made of crown glass (n = 1.52). If the light ray in glass incident on the glass-to-liquid boundary makes an angle of 30 degrees with the normal, what is the angle of the corresponding refracted ray with respect to the normal?

 a. 55.5 degrees b. 29.4 degrees c. 31.4 degrees d. 19.2 degrees

Snell's Law (10 seconds) | Ray Tracing and Problem-Solving (15 seconds)

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