the focal lenght of a convex lens is 50cm if an object is kept at a distance of 75cm from the lens then find the image distance and magnification produced by the lens
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the answer of the question is 20
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f=50cm
u=-75cm
v=?
Lens formula
1/v-1/u=1/f
1/v=1/f-1/u
1/v=1/50-1/75
1/v=(3-2)/150
1/v=1/150
V=150cm
Therefore the image is 150cm behind the lens
M=v/u
=150/-75
Therefore magnification is -2
u=-75cm
v=?
Lens formula
1/v-1/u=1/f
1/v=1/f-1/u
1/v=1/50-1/75
1/v=(3-2)/150
1/v=1/150
V=150cm
Therefore the image is 150cm behind the lens
M=v/u
=150/-75
Therefore magnification is -2
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