Q. The angle subtended by a circular disk of diameter 2 cm at a distance 1000 cm from your eye is
A) ${0.2}^{o}$
B) ${0.002}^{o}$
C) ${0.11}^{o}$
D) ${0.22}^{o}$
Explanation
(c) Solid angle, $\Omega = \frac{A}{r^{2}}$
$= \frac{\pi R^{2}}{r^{2}} \Rightarrow \frac{\pi \times (1)^{2}}{10^{6}} \Rightarrow 0.00018{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.