define power of a lens and write its S.I unit. name the type of lens which has a negative power. calculate the power of a concave lens whose principal focus is at a distance of 50cm from its optical centre
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the reciprocal of focal length in meters is the power of lens
s. I. unit is dipotre
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power of lens is the ability of a lens to converge or diverge a ray of light after reflection.
concave lens has negative power
focal length=-50/100 m=-1/2m
power=1/f(in m)
power=1/-1/2
power=-2D
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