Question

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 1

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

Answer 2

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