Optics Question 80

Question: A square of side 3cm is placed at a distance of 25cm from a concave mirror of focal length 10cm. The centre of the square is at the axis of the mirror and the plane is normal to the axis. The area enclosed by the image of the square is

Options:

A) 4cm2

B) 6cm2

C) 16cm2

D) 36cm2

Show Answer

Answer:

Correct Answer: A

Solution:

m=IO=fu−f=1025−10=1015=23

m2=AiAo⇒Ai=m2×Ao

=(23)2×(3)2=4cm2

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