Question

Find power of a convex lens which forms a real and inverted image of magnification - 1of an object placed at a distance of 20 cm from its optical centre.

Answer 1

u= -20cm , m= -1 [given]

since magnification is given so, m=v/u

                                         implies v= mu

                                                        =( -1) * ( -20)

                                                         =20 cm

focal length(f)

1/f = 1/v - 1/u =1/20 - ( 1/-20) =1/10

implies, f = 10 cm

so, the power of convex lens= 1/f(in m) = 1/(10/100) = 100/10 = 10D

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do mark brainlest

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Answer 2

answer of power of convex lens is 10 D