Optics Question 935

Question: An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm The size of the image is

[BVP 2003]

Options:

A) 9.2 cm

B) 10.5 cm

C) 5.6 cm

D) 7.5 cm

Show Answer

Answer:

Correct Answer: D

Solution:

R=−30cm⇒f=−15cm

O=+2.5cm,

u=−10cm By mirror formula 1−15=1v+1(−10)⇒v=30cm. .

Also IO=−vu⇒I(+2.5)=−30(−10)

⇒I=+7.5cm.

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