Suppose we have a laser emitting a diffraction-limited beam (=632 nm) with a 2-mm diameter. How big a light spot from this laser would be p

Question

Suppose we have a laser emitting a diffraction-limited beam (=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 Earth’s atmosphere

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Mộc Miên 5 years 2021-09-05T15:17:33+00:00 1 Answers 47 views 0

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  1. vankhanh
    0
    2021-09-05T15:18:43+00:00
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    Answer:

    Explanation:

    λ = wave length = 632 x 10⁻⁹

    slit width a = 2 x 10⁻³ m

    angular separation of central maxima

    = 2 x λ /a

    = 2 x 632 x 10⁻⁹ / 2 x 10⁻³

    = 632 x 10⁻⁶ rad

    width in m of light spot.

    = 632 x 10⁻⁶  x 376000 km

    = 237.632 km

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