Question

A convex lens of focal length 2m has an object placed at
a distance of 0.5 m from it. The image formed is
(1) Real, at a distance of 2/3 m from the lens
(2) Virtual, at a distance of 2/3 m from the lens
(3) Real, at a distance of 0.4 m from the lens
(4) Virtual, at a distance of 0.4 m from the lens



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Answer 1

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Answer 2

Answer:

Based on the info given, the magnification produced will be, m and −m

Hence,

u

1

=f(1+

m

1

)

u

2

=f(1−

m

1

)

Eliminating m from the 2 equations we get,

f=

2

u

1

+u

2