Question

calculate the solid angle subtended by the periphery of an area of 1 cm square at a point situated symmetrically at a distance of 5 cm from the area.

Answer 1

Solid angle

given :

area = 1 cm^ 2

and d = 5 cm

solid angle is the ratio of the area and the square of the distance of area from the point.

therefore

solid angle

=

$\frac{area \: }{d {}^{2} }$

now put the values

then ,

solid angle

$= \frac{1 }{5 × 5}$

$= \frac{1 }{25}$

= 0.04 steridian...

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