Question

an object 4 cm tall displaced at a distance of 40 cm from concave mirror of focal length 20 cm . find the position and height of image

Answer 1

ho=4 cm

u= -40 cm

f=20 cm

1/f=1/v+1/u

1/v=1/f-1/u

   =1/20+1/-40

   =3/-40

v=-40/3

=-13.33 cm

-v/u=hi/ho

13.33/40=hi/4

hi=1.33

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