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Minimum Deviation

Ray diagram f...

Question

Ray diagram for two lenses kept at some distance given in the diagram,which of the following option is correct ( $f_{1}, f_{2} =$ focal length; $d =$ distance between lenses )

A

f_{1} + f_{2} > d

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B

f_{1} + f_{2} < d

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C

f_{1} + f_{2} = d

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D

Combination behaves like converging lens

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Solution

The correct option is B $f_{1} + f_{2} = d$
$Parallel ray meets at focus after Refraction and ray passes through focus become parallel after refraction. ∴ clearly from figure d=f1+f2$
Heace, (c) is correct option.

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