Question

What is
20 सेमी० फोकस दूरी वाले अवतल लेंस की क्षमता ज्ञात कीजिए।
Find the power of a concave lens of focal length 20 cm​

Answer 1

Answer:

Explanation:

Power of a lens is reciprocal of its focal length. It is given by : So, the power of a concave lens is (-5 D).

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Answer 2

Explanation:

Power of a lens is reciprocal of its focal length. It is given by : So, the power of a concave lens is (-5 D).