Question

a concave mirror forms an inverted image of size double than that of object.the focal length of the mirror is 15 cm.find the position of the image and object.​

Answer 1

Explanation:

Given, v=2u , f=15cm

Now,

1/u + 1/v = 1/f

1/u + 1/2u = 1/15

2u+u/(2u)(u) = 1/15

3u/2u² = 1/15

By cross-multiplication, we get–

45u = 2u²

45u = 2u×u

45 = 2u

45/2 = u

after that u know what to do