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47W/ is the intensity of the light that emerges from the filter
Use Malus's law, the intensity of the light is,
I=, cos² ∅
The intensity of the beam from the first polarizer is equal to the half of
the initial intensity.
=
/2
Substitute the numerical values we get
94 W/m² 2
= 47 W/m²
What is intensity ?
In physics, the power transferred per unit area is known as the intensity or flux of radiant energy, where the area is measured on a plane perpendicular to the direction of the energy's propagation. Watts per square meter (W/m2) and kilograms per square meter (kg/s3) are the units used in the SI system. With waves like acoustic waves (sound) or electromagnetic waves like light or radio waves, intensity is most usually employed to describe the average power transfer across one period of the wave. Other situations where energy is exchanged can also be described in terms of intensity. One could, for instance, figure out how much kinetic energy each drop of water from a sprinkler is carrying.
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