With an ideal corner cube, the reflected ray is precisely parallel to the incide

Question

With an ideal corner cube, the reflected ray is precisely parallel to the incident ray. No corner cube will ever be perfect, however. The astronauts who visited the Moon left corner cubes so that scientists can do experiments in which light is reflected from the Moon and back to the Earth. Suppose one of these corner cubes has an angle of ? = 90.00002

With an ideal corner cube, the reflected ray is precisely parallel to the incident ray. No corner cube will ever be perfect, however. The astronauts who visited the Moon left corner cubes so that scientists can do experiments in which light is reflected from the Moon and back to the Earth. Suppose one of these corner cubes has an angle of ? = 90.00002 degree (see the following figure). By what distance will the reflected ray miss its target on the Earth? m

Explanation / Answer

the reflected ray will be displaced an angle of2*0.00002=4*10-5

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