Question

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 length
and its power used by each of them?
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Answer 1

Answer:

power of lens=1/it's focus length (f)

SI unit dioptre D

CGS unit cm^-1

first student uses convex lens and second one uses concave lens

the power of their lenses are respectively 2 and -2 respectively.

:)

Answer 2

Answer:

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