Question

a concave lens has focal length of 20 at what distance from lens at 5 cm tall object be placed so that it from an image at ,15cm from the lens also calculate the size of image​

Answer 1

Answer:

Explanation:concave lens

F= -20 cm

Ho= 5cm

V= -15cm

1/v - 1/u = 1/f

1/u= 1/v -1/f

1/u = -1/15 +1/20

1/u=( -4+3 )/60

U = -60cm

V/u = Hi / Ho

-15/-60 = Hi/5

Hi= 1.25

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