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Question

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

Find the position,magn magnifica and Nature of image


Solution

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.

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