Question

tum.jinda ho tabhi bat kar rha ho
jao cake lakr ayo hum cake kataga apna hi kha tha chalo jaldi karo​

Answer 1

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The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.

yl mai snpxht pl req bheji tumhe acchept kl lo jldi