Question

image of an object is formed at 10 cm in from of a concave lens. If the focal length of concave lens is 50 cm. Find
the distance of object from the lens.​

Answer 1

Answer:

- 12.5 cm

Explanation:

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Answer 2

Answer:

f = -50cm

v = -10cm

1/f = 1/v - 1/u

1/u = 1/v - 1/f

u= f-v/ fv (by LCM)

or u= fv/f-v

u= (-50) × (-10) / (-50)-(-50)

u = (+500)/ (-40)

u = -12.5

the distance of the object from the lens is -12.5cm.