Physics Review Question Unit: Optics Year: 1993 Question#: 88 Question: 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 cm What 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. di = 24 cm return to top 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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