Question

relation between focal length & radius of curvature F=2/r​

Answer 1

Answer:

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Explanation:

The focal length (f) of a lens is the distance between the center of the lens and the point at which the reflected light, of a beam of light traveling parallel to the center line, meets the center line (principal axis). The radius of curvature (r) is the radius of the lens that forms a complete sphere.

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Answer 2

Answer:

Explanation: 1 आर्टिकल 90 मिनट द कार डिस्टेंस ऑफ 40 किलोमीटर कैलकुलेट इट्स स्पीड इन किलोमीटर