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A ruby laser beam (lambda = 694.3 nm) is sent outwards from a 2.7-meter diameter telescope to the...

Question:

A ruby laser beam ({eq}\lambda = 694.3 \, \mathrm{nm} {/eq}) is sent outwards from a 2.7-meter diameter telescope to the moon, {eq}384\,000 \, \mathrm{km} {/eq} away. What is the radius of the big red spot on the moon?

Diffraction of Light:

Diffraction of Light explains wave behaviour of light. Light can't travel in straight line for long distance. When light passes through some aperture, it diffracts causing fringe formation by constructive and destructive interference, such that the central bright spot is most intense.

Answer and Explanation:

We are given:

  • Wavelength of laser, {eq}\lambda \ = 694.3 \ nm {/eq}
  • diameter of telescope aperture, d = 2.7 m

Distance of moon, L = 384000 km

Radius...

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Diffraction & Interference: Physics Lab

from Physics: High School

Chapter 11 / Lesson 11
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