Question

The near point of a person is 50 cm and the far point is 0.5 m.the spectacles are used to see distant are respectively

Answer 1

what's the question mate?

Answer 2

u = -50 cm

v = -0.5 m  = -0.5 x 100 cm = -50 cm

1 /v - 1 /u = 1 /f

1 /-50 - 1 /50 = 1 /f

2 /-50 = 1 /f

f = -25 cm

Power(P) = 1 /f in meter

P = 100 /-25

P = -4 D