2.DVD players use red lasers with a wavelength of 650 nm, while Blu-ray players use blue lasers (hence the name) with a wavelength of 405 nm

Question

2.DVD players use red lasers with a wavelength of 650 nm, while Blu-ray players use blue lasers (hence the name) with a wavelength of 405 nm.
1. Which color would need a larger double slit spacing d to produce an interference pattern that has the first maxima 1 mm from the central bright spot?

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Thạch Thảo 4 years 2021-07-28T20:51:41+00:00 1 Answers 47 views 0

Answers ( )

  1. Sigrid
    0
    2021-07-28T20:53:26+00:00
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    Answer:

    Blue light

    Explanation:

    For maxima interference we have the relation

    dsin\theta=m

    where

    m =  order

    d = Slit gap

    we have the relation

    \dfrac{dy}{D}=\lambda

    y = First maxima =  1 mm (fixed)

    D = Distance to screen = 1 m (fixed)

    So, the wavelength (\lambda) needed should be larger.

    Hence, the blue light which has higher wavelength of 650 nm is to be used as it requires larger double slit spacing.

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