Answer to Question #122842 in Optics for James

Question

An object placed in front of a convex lensOf focal length 10cm produces an image at a distance of 15cm From the lensAnd on the same side as the object.Determine the position of the object

Answer 1

Given, focal length of the convex lens is $f=10cm$

Image, position is $v=-15cm$

From,lens maker formula

$$\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$$

Hence,

$$\frac{1}{10}=\frac{1}{-15}-\frac{1}{u}$$

Thus, $u=-6cm$