Question

convex lens has focal length of 20cm the image is formed 60 CM on the other side by the lens than the object distance is a)60 b)-60 c)-20 d) none of these​

Answer 1

Explanation:

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Answer 2

Answer:

Given:-

Convex lens

Image distance (v) = 60cm

Focal length (f) =20

To ask:-

object distance (u) =?

Using lens formula:-

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f} \\ \frac{1}{u} = \frac{1}{v} - \frac{1}{f} \\ \frac{1}{u} = \frac{1}{60} - \frac{1}{20} \\ \frac{1}{u} = \frac{1 - 3}{60} \\ \frac{1}{u} = \frac{ - 2}{60} \\ u = \frac{ - 60}{2} \\ u = - 30cm$

Object distance is -30cm.

means 30 cm in front of lens.

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