First slide

The lens

Question

A film projector magnifies a 100 cm² film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is

Moderate

A

1600 cm²
B

400 cm²
C

800 cm²
D

200 cm²

Solution

$m_{L} = 4 m_{A} = {(m_{1})}^{2} so that A^{'} = A_{0} \times 16 = 1600 {cm}^{2}$

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