Question

An object is placed 20 cm away from a concave lens. The focal length of the lens is 10 cm. Find the image distance.


Answer 1

Answer:

u = - 20cm , f = -10 cm

1/v - 1/u = 1/f

1/v = 1/f + 1/u

= 1/-10 + 1/-20

= 1/-10 - 1/20

= -2 - 1/20

= -3 / 20

v = 20/-3

v = - 6.6 cm

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