What is meant by power of lens? Write its s.i. unit? A student uses a focal length of 40cm and another of -20 cm. Write its nature and power of each lens
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The power of lens is defined as how much of light rays it converge or diverse light rays
S.I unit is (DIOPTER)
Nature of first lens is CONVEX LENS
POWER IS 2.5 D
Nature of second lens is CONCAVE LENS
POWER IS -5.0D
S.I unit is (DIOPTER)
Nature of first lens is CONVEX LENS
POWER IS 2.5 D
Nature of second lens is CONCAVE LENS
POWER IS -5.0D
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