What is meant by power of a lens? write its si unti.a student uses a lens of focal length 40cm and another of_20 cm. write the nature and power of each lens?
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Power of lens is the reciprocol of focal length in meters.
It's SI unit is dioptre (D).
Lens with focal length 40 cm is convex lens
Lens with focal length -20 cm is concave lens.
40 cm = 0.4 m
It's SI unit is dioptre (D).
Lens with focal length 40 cm is convex lens
Lens with focal length -20 cm is concave lens.
40 cm = 0.4 m
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