The solid angle subtended by the periphery of an area `1cm^(2)` at a point situtated symmetrically at a distance of 5 cm from the area is

Calculate the solid angle subtended by the periphery of an area of 1 cm^(2) at a point situated symmetrically at a distance of 5 cm from the area.

Calculate the solid angle subtended by the periphery of an area of 1cm^2 at a point situated symmetrically at a distance of 5 cm from the area.

Calculate the solid angle subtended by the periphery of an area of 1 cm^2 at a point situated symmetrically at a distance of 5 cm from the area.

Calculate the solid angle subtended by the periphery of an area of 1 cm^2 at a point situated symmetrically at a distance of 5 cm from the area.

What solid angle will be subtended by a surface area dS at a point distant r from it?

The angle subtended by a coin of radius 1 cm held at a distance of 80 cm from your eyes is

The angle subtended by a coin of radius 1 cm held at a distance of 80 cm from your eyes is :