Q. The unit of focal length is

फोकल लंबाई की इकाई है

A
Diopter
डायोप्टर
B
Meter
मीटर
C
Hertz
हेटर्स
D
Candela
कैन्डेला

Explanation

Focal length is the distance from the lens or mirror to its focal point, so its unit is meters (or centimeters). It measures how strongly the lens converges or diverges light.

फ़ोकल लंबाई लेंस या दर्पण से उसके फ़ोकल पॉइंट तक की दूरी है, इसलिए इसकी इकाई मीटर (या सेंटीमीटर) है। यह मापता है कि लेंस प्रकाश को कितनी दृढ़ता से अभिसरित या अपसारित करता है।

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