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Cutting of Thin Lenses

A parallel be...

Question

A parallel beam of monochromatic light falls on a combination of a convex lens and a concave lens of focal lengths 15 cm & 5 cm respectively.If the light emerges parallel from the concave lens. The distance between two lenses is

A

20 cm

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B

3 cm

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C

10 cm

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D

45 cm

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Solution

The correct option is C 10 cm
$f_{1} = 15 c m f_{2} = - 5 c m d = ?$

$f e q = \frac{f_{1} f_{2}}{f_{1} + f_{2} - d}$

$n o$ $refraction$

$\Rightarrow f_{1} + f_{2} = d$

$15 - 5 = d$

$\Rightarrow d = 10 c m$

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