Question

10. A convex lens of power +2.0 D
and a concave lens of power -2.0 D
are kept in contact with each other.
What will be the focal length of the
combination of the lenses?
0
+ 50 cm​

Answer 1

The power of combinations of the lenses is the algebraic sum of powers of the individual lenses.

Power of combination of lenses = +2.0D + (-2.0D)

= 2D-2D

= 0

Power of combination of lenses = 1/f(in m)

0 = 1/f

f = 1/0

f = infinity

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