An object is placed perpendicular to the principal axis

Asked by admin @ 11/08/2021 in Physics viewed by 281 People

An object is placed perpendicular to the principal axis of a convex lens of focal length 20cm. the distance of the object from the lens is 30cm.

find the 1)position
2)the magnification
3)the nature of the image formed.

Answered by admin @ 11/08/2021

Hi Dude

i) As the lens is convex

u= -30 cm
f= 20 cm
v=?

Using lens formua

1/f=1/v-1/u

1/v = 1/f+1/u
v= uf/u+f
= -600/-10
= 60 cm

As v is positive so image is real

ii) M= v/u = 60/-30 = -2

iii) Image is real.

hope it helps

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