A man is shaving with his chin 0.4m from a concave magnifying mirror. If the linear
magnification is 2.5, what is the radius of curvature of the mirror?
(a) 1.73 m
(b)-1.52 m
(c) 1.45 m
(d) None of those
Answers
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1
Answer:
d
Explanation:
I = image height
O = object height
Magnificatin = I/o = 2.5
v = 2.5 O
1/i + 1/o = 1/f
-(1/2.5o) + 1/o = 1/f
(1/o )(-2/5 + 1) = 1/f
(1/o)*(3/5) = 1/f
f = O×(5/3)
= 0.4 × 5/3
= 2/3
R = 2*2/3 = 4/3 = 1.33
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