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  4. Calculate focal length of given lens if the magnification is -0.5.

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Q. Calculate focal length of given lens if the magnification is -0.5.Physics Question Image

AIIMSAIIMS 2019

Solution:

Magnification for lens = $\frac{f}{u+ f} \quad\Rightarrow \quad\quad-\frac{1}{2}=\frac{f}{-20+f}$
- 20 + f = - 2f
- 20 = -3f
f = 20/3
= 6.66 cm