Question

A convex lens and concave lens of focal length 50 cm and 40 cm respectively are combined together what is the power of the combination

Answer 1

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Answer 2

0.5 D is the power of the combined lenses.

Explanation:

Given that,

Focal length of convex lens = 50cm

Focal length of concave lens = 40 cm

To find,

Combined power = ?

Procedure:

$P_{convex}$ = 100/50

= +2D

$P_{concave}$ = 100/-40

= -2.5 D

$P_{eq}$ = -2.5 + 2

= - 0.5 D

Learn more: Concave lenses

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