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Question: Answered & Verified by Expert
A film projector magnifies a $100 \mathrm{~cm}^2$ film strip on a screen. If the linear magnification is 4 , the area of magnified film on the screen is
PhysicsRay OpticsJEE Main
Options:
  • A $1600 \mathrm{~cm}^2$
  • B $400 \mathrm{~cm}^2$
  • C $800 \mathrm{~cm}^2$
  • D $200 \mathrm{~cm}^2$
Solution:
1075 Upvotes Verified Answer
The correct answer is: $1600 \mathrm{~cm}^2$
$\begin{aligned} & m_L=4 \\ & m_A=\left(m_1\right)^2 \text { so that } A^{\prime}=A_0 \times 16=1600 \mathrm{~cm}^2\end{aligned}$

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