    Question

# Convex lens of focal length 15 cm is kept in series with a concave lens of focal length 30 cm. Find the power of the combination of lenses?

A

3.33 D

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B

+ 0.033 D

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C

- 0.6 D

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D

+ 0.6 D

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Solution

## The correct option is A 3.33 D Given, focal length of convex lens f1=+15 cm=0.15 m and focal length of concave lens f2=−30 cm=−0.30 m. We know, Power of lens P=1focal length Power of convex lens P1=10.15 and Power of concave lens P2=1−0.30 Total Power of combination (Ptotal) = P1 + P2 = 10.15 - 10.30 Ptotal = 3.33 D Therefore, the total power of combination is 3.33 D.  Suggest Corrections  0      Similar questions  Related Videos   Lens Formula, Magnification and Power of Lens
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