1.

Find the focal lengths of a lens of power -2.0 D, What type of lens is this?

Answer»

Given, Power = -2.0

The given lens is concave (power of concave lens is -ve)

P = \(\frac{1}{f(in\,metre)}\)

-2.0 = \(\frac{1}{f}\)

∴ f = \(\frac{1}{-2}m\) = -50 cm

∴ the focal length is = -50 cm.



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