The sizes of the image and object are equal in a lens of focal length 20 cm. Name
the type of lens and distance of object from the lens.
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0
Answer:
f=20cm
and v=40cm
v
1
−
u
1
=
f
1
⟹
40
1
−
u
1
=
20
1
⟹
u
1
=
40
−1
⟹u=−40cm
magnification m=
u
v
=
−40
40
=−1
Hence, the image formed is real , inverted and of same size as that of the object.
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