A concave mirror of radius of curvature forms an image of the Sun

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A concave mirror of radius of curvature

20\text{ cm}

forms an image of the Sun. The diameter of the Sun subtends an angle

1^\circ

at the Earth. Then the diameter of the image is, in cm: (a)

\frac{2\pi}{9}

(b)

\frac{\pi}{9}

(c)

20

(d)

\frac{\pi}{18}