What is meant by power of a lens? Write its SI unit.
A student uses a lens of focal length 40 cm and another of -20 cm. Write the nature and power of
each lens. [3]
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2
Answer:
Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of power = Dioptre (D) Power of lense = 1/ focal length in meter.
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Answer:
we know that power P=2.5D
P=f1
f=2.51=0.4m=40cm
Since the focal length of lens is positive so it is a convex lens. It is a converging lens.
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