Kohul asked in Science & MathematicsPhysics · 5 months ago

For a ruby laser of wavelength 694nm, the end of the ruby crystal is the aperture that determines the diameter of the light beam emitted.?

If the diameter is 1.5cm and the laser is aimed at the moon, find the approximate diameter of the light beam when it reaches the moon, assuming the spread is solely due to diffraction.

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