SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Power of the lens is-40, its focal length is
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4m
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-40m
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-0.25m
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-25m
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Explanation:
Detailed explanation-1: -Here, P is the power of the lens and f is the focal length of the lens in meter (m). Given, P =-40 D. f =-0.025 m. Thus, the focal length of the lens is-0.025 m.
Detailed explanation-2: -The correct answer is option 4, i.e.-2.5 D. The Power of the diverging lens is-2.5 D.
Detailed explanation-3: -The power of a lens is defined as the reciprocal of its focal length in meters, or D=1f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.
There is 1 question to complete.