Science, asked by srushtipatil70, 1 year ago

why positive focal length is used in concave lense & negative focal length in convex lense​

Answers

Answered by shiva77332
2

you can easily verify that the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens. So f is positive for a convex lens and negative for a concave lens. The reason is the sign altering of v.

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