Question

A convex lens has a focal length of 3 centimeters. How far from the mirror is the object, if the image formed is 4 centimeters
away?
3 cm
1 cm
10 cm
8 cm

Answer 1

Answer: 8 Cm

Explanation:

As per lens formula of convex lens,

1/f = 1/v - 1/u

=> 1/3 = 1/4 - 1/u

=> 1/u = 8.3cm

= 8 cm approx.

Hence the answer is 8cm

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Answer 2

Answer:

8 cm

Explanation:

1/f=1/v-1/u

1/3=1/4-1/u

So 1/u=8.3

So approximate distance is 8 cm

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