. A concave shaving mirror has a radius of curvature of 30 cm. It is positioned so that the (upright) image of a man’s face
is 3 times the size of the face. How far is the mirror from the face (in cm)
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2
Answer:
10cm
Explanation
Because the radius of curvature is 30 cm, the focal length is f = r/2 = 15 cm.
An upright image three times the object size corresponds to a magnification of m = −i/p = 3.
This implies that i = −3p and 1/p+1/i = 1p−1/(3p) = 2/3p = 1/f.
The object distance is (2/3)f = 10 cm.
Answered by
0
Answer:
80 cm
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