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Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm.

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asked Dec 30, 2017 in Physics by Rohit Singh (61,782 points) ● 35 ● 133 ● 358

Define power of a lens. What is its unit? One student uses a lens of focal length 50 cm and another of –50 cm. What is the nature of the lens and its power used by each of them?

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answered Dec 30, 2017 by Rohit Singh (61,782 points) ● 35 ● 133 ● 358
 
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Hint — P = 1/f where f is in metre. Its unit is Dioptre. Lens is convex in the first case and concave in the second case. Power is equal to 2 dioptre in the first case and –2 dioptre in the second case.

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