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# Two black objects of the same diameter, a sphere and a disc are placed in front of a uniform beam of light. The plane of the disc is perpendicular to the light rays. The force acting upon them by the light is:(A) zero (B) bigger on the disc(C) bigger on the sphere(D) the same on both

Last updated date: 20th Jun 2024
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Hint:The force acting upon the plane of the disc by the light when the light ray is perpendicular to the plane of the disc. The force exerted by the beam of light depends on the power of the light and the speed of the light. By using the formula, the force acting by the light is determined.

Formula used:
The force exerted by the beam of light on the plane surface is given by,
$F = 2\dfrac{P}{C}$
Where, $F$ is the force exerted by the beam of the light on the plane surface, $P$ is the power of the light and $C$ is the speed of the light at that instant of the light touches the plane surface.

$F = 2\dfrac{P}{C}$