What does a lens with a power of 1 dioptre indicate?
What does a lens with a power of 1 dioptre indicate?
1 डायोप्टर शक्ति वाला लेंस क्या दर्शाता है?
Detailed Solution & Logic
It has a focal length of 1 metre. / इसकी फोकस दूरी 1 m है।
Explanation
English:
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The power of a lens (P) in dioptres is given by the formula: $P = \frac{1}{f}$, where $f$ is the focal length in metres.
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If a lens has a power of 1 dioptre, then its focal length is: $f = \frac{1}{1} = 1$ metre.
Extra fact:
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A convex lens of 1 D converges parallel rays of light to a point 1 metre from the lens.
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For concave lenses, the focal length is negative, but the power is still calculated in the same way.
Hindi:
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लेंस की शक्ति (Power, P) डायोप्टर में इस प्रकार होती है: $P = \frac{1}{f}$, जहाँ f फोकस दूरी (मीटर में) है।
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यदि लेंस की शक्ति 1 डायोप्टर है, तो फोकस दूरी: $f = \frac{1}{1} = 1$ मीटर।
अतिरिक्त तथ्य:
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1 D शक्ति वाला उत्तल लेंस (Convex lens) समानांतर प्रकाश किरणों को 1 m दूरी पर फोकस करता है।
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अवतल लेंस (Concave lens) के लिए फोकस दूरी ऋणात्मक होती है, लेकिन शक्ति की गणना वही रहती है।
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