Question

A concave mirror of focal length 100cm
is used to obtain the image of the sun which subtends an angle of 30{}^\circ .
The diameter of the image of the sun will be
A) 1.74cm B) 0.87cm C) 0.435cm D) 100cm

Answer 1

so 0.87 cm is the answer

Answer 2

Dear Student,

◆ Answer - (B)

0.8727 cm

● Explanation -

Given that angle subtended by the image of sun is θ = 30' = 1/2 × π/180 = π/360.

Diameter of the image of sun is -

D = f × θ

D = 100 × π/360

D = 100 × 3.142/360

D = 0.8727 cm

Hence, diameter of image of sun is 0.8727 cm.

Thanks dear. Hope this helps you...