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What is Fresnel's distance ?...

What is Fresnel's distance ?

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Fresnel's distance is the distance from a slit, at which diffraction spread of a beam becomes equal to width of the slit.
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What is Fresnel diffraction?

Light of wavelength 5,500 Å is illuminated on a slit. Calculate the slit width if Fresnel distance for diffraction set-up is 4 m.

Knowledge Check

  • What is the Fresnel distance for an aperture of 3 mm and wavelength 400 nm?

    A
    8.5 m
    B
    22.5 m
    C
    10 m
    D
    15 m

  • What is the least distance of distinct vision?

    A
    10 cm
    B
    15 cm
    C
    20 cm
    D
    25 cm

  • For an aperture of size a illuminated by a parallel beam of light having wavelength 1, the Fresnel distance is:

    A
    `=a//lambda`
    B
    `=a^(2)//lambda`
    C
    `=a^(2)lambda`
    D
    `=a//lambda^(2)`

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    Calculate Fresnel distance for aperture of 1mm using Red light of wavelength 7000Å.

    What is the shortest distance measured indirectly so far ?

    What is the shortest distance measured indirectly so far ?

    What is the image distance of an object which is placed at an infinite distance ?

    For an aperture of 2mm and wavelength of 500 nm , Fresnel distance is

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