ठोस कोण किसे कहते हैं? Thos Kon Kise Kahate Hain?
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ठोस कोण किसे कहते हैं? Thos Kon Kise Kahate Hain?

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Thos Kon Kise Kahate Hain

ठोस कोण (Solid Angle) : ठोस कोण $d \Omega$, चित्रानुसार शीर्ष $O$ को केन्द्र की भाँति प्रयुक्त करके उसके परितः निर्मित गोलीय पृष्ठ के अपरोधन क्षेत्र $d A$ तथा त्रिज्या $r$ के वर्ग का अनुपात होता है। अर्थात् —

$d \Omega=\frac{d A}{r^2}$

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