Physics, asked by SainiAman22, 11 months ago

The size of the image formed by convex lens of focal lenght 20 cm is observed to be reduced 1/3rd of its size . Find the distance of object from the optical centre .

Answers

Answered by subhi24
3

object distance is -80cm and image distance is -80/3 cm

Answered by gadakhsanket
0
Dear student,

ā— Answer -
u = -40 cm

ā— Explanation -
# Given -
h2/h1 = 1/3
f = 20 cm

# Solution -
Magnification by comvex lens is given by -
M = h2/h1 = -v/u
1/3 = -v/u
v = -u/3


According to lens formula -
1/f = 1/u + 1/v
1/20 = 1/u - 3/u
u = -40 cm

Therefore, object is 40 cm from optical centre of lens.

Hope this helped...

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