Question

person needs a lens of power of -4.5D for correction of her vision.
(i) What is the focal length of corrective lens.
(ii) What is the nature of corrective lens?

Answer 1

Power, D= - 4.5

D = 1/ focal length in mtrs

F = 1/-4.5

F = - 10/45

F = - 2/9

Focal length = - 0.22 mtrs.

Type of lens used is concave since F is negative

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