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2 years ago

The image of an object placed 30cm from a diverging lens is formed 10cm in front of the lens.

Physics

1 answer:

luda_lava [24]2 years ago

6 0

Answer:

15cm

Explanation:

Since the lens is a diverging lens, the image distance is negative (virtual)

v = -30cm

u = 10cm

Required

focal length f

Using the lens formula;

1/u + 1/v = 1/u

1/10 - 1/30 = 1/f

(3-1)/30 = 1/f

2/30 = 1/f

f = 30/2

f = 15cm

Hence the focal length of the lens is 15cm

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