Q. The power of a concave lens is always

अवतल लेंस की शक्ति सदैव होती है

Zero
शून्य

Negative
नकारात्मक

Positive
सकारात्मक

Imaginary
काल्पनिक

Concave lenses are diverging lenses and have negative focal lengths, so their power is always negative.

अवतल लेंस अपसारी लेंस होते हैं और उनकी फोकस दूरी ऋणात्मक होती है, इसलिए उनकी क्षमता हमेशा ऋणात्मक होती है।

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