what is meant by power of A lens right it's SI unit a student uses a lens are focal length 40 cm and another of -20 cm write the nature and power of each lens
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the degree of convergence and divergence is known as power of lens. its SI unit Dioptre represented as D. 1 power is 40 cm = 2.5 D and -20cmof power is -5D . feom that 2.5D is virtual and erect aswell as convex lens -5D real and inverted aswell as concave lens.
Afthabanthas:
1/40=0.025 right??
it was in cm we should make into m
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