Question

. An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. Find
the nature and distance at which image will be formed.​

Answer 1

ANSWER:

GIVEN:

• V=15cm.

•f=10cm

FIND:

FIND U.

CALCULATION :

USE MIRROR FORMULA:-

1/U+1/V=1/F

.°.1/U+1/15=1/10

.°.1/U=1/$\cancel{15}$×$\cancel{30}$+ 1/$\cancel{10}$×$\cancel{30}$

.°.u=2+3/30

.°.u=5/30

.°.u=6cm.