Question

a convex and concave lens of the same power are kept in contact i) what is the power of the combination ii) how does the combination of lenses behave like

Answer 1

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 100f were f is focal length in centimeters.

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Answer 2

Answer:

The combined power is the algebraic sum of the individual powers of the lenses. Therefore, the power of the combination of the lenses is - 2.5 D. ... The negative sign shows that the combination of the two lenses causes it to behave like a concave lens.

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