a person needs a lens of power -4. D what kind of defect he is suffering from name the corrective lens find its focal length
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He is suffering from Myopia .
julie27:
focal length
What focal length you need ? lens or eye
Answered by
16
The person is suffering from myopia because power is negative and Concave lens has negative power and concave lens is used to correct the defect of vision called myopia.
Power = 1/f
-4=1/f
f=1/-4
f= - 0.25m or -25cm
Hence focal length is -25cm or - 0.25m
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