# Unit 13 Review

Reflection

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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. Distinguish between diffuse and regular (specular) reflection in terms of both cause and result.

Specular vs. Diffuse Reflection (22 seconds)

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 21. Consider the following object in front of a plane mirror. Construct a ray diagram to show how light tavels from the object (arrow) to the mirror and ultimately to the eye; then indicate the portion of the mirror needed in order for the eye to view the image.

Ray Diagrams for Plane Mirrors (11 seconds)

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22. Construct ray diagrams to show where the images of the following objects are located. Dray in the complete image and describe its characteristics (real or virtual, enlarged or reduced in size, inverted or upright). (NOTE: review the ray diagrams for all possible objects locations for each device.)

 Concave Mirror: when the object is located between C and F, the image is an inverted real image located beyond C and magnified in size. Convex Mirrors produce upright virtual images located on the other side of the mirror which are reduced in size.

Ray Diagrams - Concave Mirrors (14 seconds) | Ray Diagrams - Convex Mirrors (8 seconds)

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