Optics Question 79

Question: A concave mirror of focal length 100cm is used to obtain the image of the sun which subtends an angle of 30. The diameter of the image of the sun will be

Options:

A) 1.74cm

B) 0.87cm

C) 0.435cm

D) 100cm

Show Answer

Answer:

Correct Answer: B

Solution:

The angle subtended by the image of the sun at the mirror =30=(12)o=π360rad .

If x be the diameter of the image of the sun, then ArcRadius=x100=12.2π360=π360

x=100π360=0.87cm



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