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Suppose we have a laser emitting a diffraction-limited beam (ļ¬=632 nm) with a 2-mm diameter. How big a light spot from this laser would be produced on the surface of the Moon (distance to the Moon is R=376000 km)? Neglect any effects of the Earthā€™s atmosphere

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Answer:

Explanation:

Ī» = wave length = 632 x 10ā»ā¹

slit width a = 2 x 10ā»Ā³ m

angular separation of central maxima

= 2 x Ī» /a

= 2 x 632 x 10ā»ā¹ / 2 x 10ā»Ā³

= 632 x 10ā»ā¶ rad

width in m of light spot.

= 632 x 10ā»ā¶ Ā x 376000 km

= 237.632 km

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