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In: Physics

An unpolarized, cylindrical beam of light with an intensity of 12000 W/m² and a radius of...

An unpolarized, cylindrical beam of light with an intensity of 12000 W/m² and a radius of 1 cm passes through two polarizing filters that differ in angle by 30° before striking the center of a perfectly reflective square plate that measures 2 cm on a side. Find the force from the radiation pressure

Solutions

Expert Solution


The actual intensity that is incident on plate is I2.

Since the plate is perfectly reflecting the radiation pressure is multipled by 2 i.e. pressure will be exerted when light hits the plate and when it reflects back.

The radius of beam is given in question so that first power can be calculated and then force can be calculated using power. Power will be intensity * 4 Pi r^2.

However force can be calculated using intensity instead.

Radiation pressure will be 2 * I / c.

I hope this will help you!

genius_generous answered 1 year ago
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