#### Question

Calculate the focal length of a corrective lens having power +2D.

#### Solution

Given: Focal length f = +2 D

Power ,p=1/f

∴f=1/p=1/2

∴f=0.5m

The power of the corrective lens is 0.5 m.

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#### APPEARS IN

Solution Calculate the Focal Length of a Corrective Lens Having Power +2d. Concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens.