Power of a lens is -40 , its focal length is

4 m

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- 40 c m

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- 0.25 m

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- 25 m

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Solution

The correct option is B $- 0.25 m$
$- 0.25 m$

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Similar questions

A converging lens has a focal length $40 c m$ . Calculate its power.

A double convex lens of focal length 40 cm is bisected vertically. Is there any change in the focal length and power of the lens?

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