Home
Class 12
PHYSICS
If we are to observe interference in a t...

If we are to observe interference in a thin film, why must the film not be very thick (with thickness only on the order of a few wavelength)?

Text Solution

Verified by Experts

If the film is more than a few wavelength thick, the interference fringe are so close together that you cannot resolve them.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • WAVE OPTICS

    CENGAGE PHYSICS|Exercise Exercise 2.2|22 Videos

  • WAVE OPTICS

    CENGAGE PHYSICS|Exercise Subjective|11 Videos

  • WAVE OPTICS

    CENGAGE PHYSICS|Exercise Solved Examples|10 Videos

  • THERMODYNAMICS

    CENGAGE PHYSICS|Exercise QUESTION BANK|34 Videos

  • WAVES

    CENGAGE PHYSICS|Exercise QUESTION BANK|38 Videos

Similar Questions

Explore conceptually related problems

Interference By a thin film

Thin film interference

Knowledge Check

  • For observing interference in thin films with a light of wave length lamda the thickness of the film:

    A
    may be of any magnitude
    B
    should be much smaller than `lamda`
    C
    should be of the order of `lamda`
    D
    should be a few thousand times of `lamda`

  • What is the minimum thickness of thin film required for constructive interference in the reflected light through it ? (Given, the refractive index of the film =1.5, wavelength of the lilght incident on the film =600 nm.

    A
    100 nm
    B
    50 nm
    C
    200 nm
    D
    25 nm

  • On introducing a thin film in the path of one of the two interfering beam, the central fringe will shift by one fringe width if mu=1.5 , the thickness of the film is (wavelength of monochromatic light is lamda )

    A
    `4lamda`
    B
    `3lamda`
    C
    `2lamda`
    D
    `lamda`

    • Similar Questions

    Explore conceptually related problems

    YDSE is conducted using light of wavelength 6000 Å to observe interference pattern. When a film of material 3.0 xx 10^(-3) cm thick was placed over one of the slits, the fringe pattern shifted by a distance equal to 10 fringe widths. The refractive index of the material of the film is _ _ _ _ _ .

    White light is sent downward onto a horizontal thin film that is sandwiched between two materials. The indexes of refraction are 1.80 for the top material, 1.65 for the thin film, and 1.50 for the bottom material. The film thickness is 5.00 xx 10^(-7) m. Of the visible wavelengths (400 nm to 700 nm) that result in fully constructive interference at an observer above the film, which is the (a) longer and (b) shorter wavelength? The materials and film are then heated so that the film thickness increases. (c) Does the light resulting in fully constructive interference shift toward longer or shorter wavelengths?

    In order to see diffraction the thickness of the film is

    On introducing a thin film in the path of one of the two interfering beam, the central fringe will shift by one fringe width. If mu=1.5, the thickness of the film is (wavelength of monochromatic light is lambda )

    If wavelength 4500 Å and 6000 Å are found to be missing in the reflected spectrum in thin air film interference, the thickness of the film for normal incidence is nearly

    Home
    Profile