Q. A film projector magnifies a $100\ cm^{2}$ film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is
A) $1600\ cm^{2}$
B) $400\ cm^{2}$
C) $800\ cm^{2}$
D) $200\ cm^{2}$
Explanation
(a) $m_{L} = 4$
$m_{A} = \left( m_{1} \right)^{2}$ so that $A^{'} = A_{0} \times 16 = 1600\ cm^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.