Question

3. Find the focal length of a lens of power - 2.0 D. Name the type of lens. .
Define the term dispersion of light. Name the colour which bends (i) the most​

Answer 1

Explanation:

P=-2D

P=1/f

-2=1/f

Taking reciprocal on both sides

1/-2=f

-0.5m=f

It is a concave lens

Dispersion means scattering of white light into its component colours

Violet bends the most

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