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Standard XII
Physics
Combination of Mirror and Lenses
Question

The change in the focal length of the lens, if a convex lens of focal length $$20 cm$$ and refractive index $$1.5$$, is immersed in water having refractive index $$1.33$$, is :

A
$$5.82\ cm$$
B
$$6.22\ cm$$
C
$$62.2\ cm$$
D
$$58.2\ cm$$
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Solution
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Correct option is C. $$58.2\ cm$$

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