Question

a convex lens and a concave lens of equal focal length are kept in contact find focal length and power of the lens combination​

Answer 1

Answer:

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Answer 2

Answer:

When two lenses are kept in contact, powers of the lenses are simply added.

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.

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 100f were f is focal length in centimeters.

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 100f were f is focal length in centimeters.As numerically, focal length is same but opposite in size, combined power will be Zero i.e. focal length is ∞ i.e. it is just equivalent to plane glass.