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Physics
A real image formed by a concave mirror is 4.5 times the size of the object. If the mirror is 20 cm from the object, its focal length is
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Q. A real image formed by a concave mirror is 4.5 times the size of the object. If the mirror is 20 cm from the object, its focal length is
A
$\frac{90}{11} cm$
14%
B
$\frac{120}{11} cm$
20%
C
$\frac{150}{11} cm$
15%
D
$\frac{180}{11} cm$
51%
Solution:
Correct answer is (d) $\frac{180}{11} cm$