Physics Review QuestionUnit:
OpticsYear:
1993 Question#:
88Question:
The tip of a person's nose is 12 cm from a concave (converging) spherical mirror
that has a radius of curvature of 16 cm. What is the distance from the mirror to
the image of the tip of the person's nose?(1
) 8 cm(2
) 12 cm(3
) 16 cm(4
) 24 cmWhat is this question really asking? includes image!!!! Explanation by: LJP [ Return to question menu
]Answer 1
8 cm INCORRECT You probably subtracted the distance from the focal length to the object (16-12=8). return to top
Answer 2
12 cm INCORRECT You probably just assumed that since the object was 12 cm away, the image would be 12cm away. return to top
Answer 3
16cm INCORRECT You probably just assumed incorrectly that since the focal length was 16 cm, the image distance was 16 cm. return to top
Answer 4
24cm CORRECT since the center of the curvature is 16 cm from the mirror, the focal distance must be half of that, and therefore, 8 cm. d _{i} = 24 cm
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What's this question really asking?
When an image is reflected in a concave mirror, what is the relationship between the distance of the focal length, the distance of the object and the distance of the image. return to top |

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