Optics Question 911

Question: The image formed by a convex mirror of focal length 30cm is a quarter of the size of the object. The distance of the object from the mirror is

Options:

A) 30cm

B) 90cm

C) 120cm

D) 60cm

Show Answer

Answer:

Correct Answer: B

Solution:

m=f(f−u)⇒(+14)=(+30)(+30)−u⇒u=− 90 cm

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