When convex lens and converge lens mixed same focus?
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Effective focal length in
∞
.
Explanation:
When two lenses are kept in contact, powers of the lenses are simply added.
Power of a lens is positive for convex lens and negative for concave lens.
Numerically power of a lens is given by
100
f
were
f
is focal length in centimeters.
As numerically, focal length is same but opposite in size, combined power will be
Z
e
r
o
i.e. focal length is
∞
i.e. it is just equivalent to plane glass
∞
.
Explanation:
When two lenses are kept in contact, powers of the lenses are simply added.
Power of a lens is positive for convex lens and negative for concave lens.
Numerically power of a lens is given by
100
f
were
f
is focal length in centimeters.
As numerically, focal length is same but opposite in size, combined power will be
Z
e
r
o
i.e. focal length is
∞
i.e. it is just equivalent to plane glass
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