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Question

The solid angle subtended by the periphery of an area 1cm2 at a point situated symmetrically at a distance of 5 cm from the area is

A
2×102 steradian
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B
4×102 steradian
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C
6×102 steradian
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D
8×102 steradian
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Solution

The correct option is B 4×102 steradian
Given data,
Area=1cm2
Distance=5cm
Solid angle Ω=?
We know the formula
Solid angle Ω=Area(Radial distance)2

=1cm2(5cm2)=125

=4×102steradian
The solid angle is for 3D figure like spere, cone, etc and plane angle is for plane objects or 2D figure like circle,arc etc.

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