Question

a concave lens of focal length 15 cm forks an image 10 cm from the lens. how far is the object placed from the lens ? draw the ray diagram.​

Answer 1

Answer:

Explanation:

u = ?

f = 15cm

v = 10 cm

According to lens formula

1/f = 1/v - 1/u

1/15 = 1/10 - 1/u

-1/30 = -1/u

So , u or object distance = 30cm