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Q.

When is the magnitude of the power of a lens equal to its focal length?

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a

When the focal length is one metre

b

When the focal length is two metres

c

When an image is formed at focus

d

When the object is placed at focus

answer is A.

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Detailed Solution

When the focal length is one metre, then the magnitude of the power of a lens is equal to its focal length.
The ability of a lens to diverge or converge the rays of light is called the power of the lens. It is defined as the reciprocal of the focal length of the lens.

P = \frac{1}{f}

Therefore, when the lens's focal length is equal to one metre, the power of the lens is also one in magnitude.

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