Question

The length of the real image of an object is twice the length of the object , placed at 25cm from a convex lens .
Find the power of convex lens .​

Answer 1

Answer:

magnification=2

but it is a real and inverted image

and we know that a real and inverted image has a negative magnification

so magnification=-2

formula for magnification=v/u

-2=v/u

-2=v/25

v=-50cm

now lens formula=1/v-1/u=1/f

1/f=1/-50+1/25

1/f= 1/50

f= 50 cm

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Answer 2

Answer:magnification = -2 as it is real and inverted

U = -25 object distance is always negative

V/u = -2

V/-25=-2

V=50 cm

1/f = 1/v-1/u

f= 50/3 cm

Power = 1/(50/3)

= 3/50

Power = 0.6dioptre

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