The image of an object is located 6cm behind a convex mirror. If it’s magnification is 0.6, calculate the focal length of the mirror
-
A.
3.75cm -
B.
6.70cm -
C.
10.00cm -
D.
-15.00cm
Correct Answer: Option D
Explanation
V = -6cm
M = 0.6cm
Recall m = (frac{V}{U})
U = (frac{V}{M})
U = (frac{6}{0.6})
U = 10
(frac{1}{U}) + (frac{1}{V}) = (frac{1}{F})
(frac{1}{10}) + (frac{1}{-6})
= (frac{1}{F})
(frac{-4}{60}) = (frac{1}{F})
F = (frac{60}{-4})
= -15cm
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