Define power of lens and write its si unit name the type of lens which has negative power calculate the power of lens whose principal focus is at a distance 50cm from its optical centre

Define power of lens and write its si unit name the type of lens which

1.	Define power of lens and write its si unit name the type of lens which has negative power calculate the power of lens whose principal focus is at a distance 50cm from its optical centre
Answer» The DEGREE of CONVERGENCE or divergence of a lens is called POWER of the lens. Its si unit is dioptre. Concave lens has negative power. Power of the lens, P = 1/f(m) = 100/50 = 2 D

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Define power of lens and write its si unit name the type of lens which has negative power calculate the power of lens whose principal focus is at a distance 50cm from its optical centre

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