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What is the solid angle substended by hemisphere on an external point?

What is the solid angle substended by hemisphere on an external point?

Grade:11

1 Answers

Nirmal Singh.
askIITians Faculty 44 Points
7 years ago
Solid angle dw = dA cos Theta / R2

For hemisphere surface area will be half so the solid angle will be 2 pi at an external point its unit is steradian dw = 2piR2cos 0 / R2 =2 pi steradian ….............................

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