Question

Noopur needs a lens of power. 2.5 D for correction of her vision A defect of vision is she suffering B what is the focal length and nature of the corrective lens? C draw ray diagram showing the A detected eye B correction for this defect

Answer 1

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Answer 2

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Mate!!!

(a)Noopur is suffering from the defect name "Myopia"(or short sightedness).

(b)Here the power of the lens P = -4.5 D

Therefore, The Focal length of the lens F = 1/P

                                                                    =1/-4.5 m

                                                                    =1000/-45 cm

                                                                    =-22.2 cm.

The -ve sign of power shows that the lens is a concave lens(diverging lens).

(c)Ray Diagrams are given here:

(i)Defective.

(ii)Correction of myopia.

(d)The possible cause of myopia defect is either:

(i)Excessive curvature of the cornea or,

(ii)Elongation of the eye ball.

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