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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Far point, u =80 cm = 0.8 m to correct far point should be infinity, v =infinity applying lens law, 1/v -1/u = 1/f ⇒ 0 - 1/0.8 = 1/f ⇒1/f = (-1/0.8)= - 1.25 now, power of lens = 1/f = -1.25D So, to correct that myopic eye concave lens of power (- 1.25 D) is required.

The person is suffering from myopia so, he need concave lens to correct his vision. For this, image distance,v=-80cm object distance,u=infinitey now by lens formula 1/v-1/u=1/f 1/-80-1/infinity=1/f 1/-80-0=1/f ( 1/infinity=0) 1/-80=1/f f=-80cm =-0.8m Now power=1/f =1/-0.8 =-1.25D therefore the power of concave lens required is -1.25D