what is meant by power of a lens? Write its SI unit. A student uses a lens of focal length 40cm and another of -20 .write the nature and power of each lens.
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power of a lens is the resiprocal of its focal length. its si unit is dioptre (D)
f = 40 cm
the lens is convex lens
p = 1/f
p = 1/40
p = 0.025 D
f = -20 cm
the lens is concave lens
p = 1/f
p = 1/-20
p = - 0.05 D
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What is meant by power of a lens?
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The power of a lens is the measure of the degree of convergence or divergence of light Ray's falling on it.
Write its SI Unit
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The SI unit is dioptre(D)
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