Question

An object is Placed 15cm in front of a convex lens of focal length 10cm . The distance of image from the object is

A) 30cm
B) 15cm
C) 45cm
D) 60cm​

Answer 1

Explanation:

OPTION (c)

Write the all information

u=-15 cm

f=10 cm

v=?

Applied the lens formula

1/v - 1/u=1/f

Put the all input in this equation

1/v+1/15=1/10

1/v=1/10-1/15

1/v=1/30

v=30cm

So

Distance of image from object = 30+15

Distance of image from object = 45 cm

i. e option (c) is correct