Question
A laser pointer emits a green 5[mW] beam with a diameter of about 0.9[mm]. ?
a) What is the electromagnetic intensity (power per unit area) directed into the small region where it hits the projector screen?
b) How large is the recoil-force on the laser pointer from that 5[mW] jet of light that it is sending across the room toward the projection screen?
c) If the projection screen was instead a reflective mirror, what force would the beam exert on the projection screen?
2d) If a lens were to focus that 5[mW] beam down to a wavelength-limited spot 0.55 microm across, how much larger would the power-per-unit-area in that target zone become?
Solution
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