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A ray of light is incident on a thin fil...

A ray of light is incident on a thin film, As shown in figure, M and N two reflected rays while P and Q are two transmitted rays. Rays N and Q undergo a phase change of `pi`. Correct ordering of the refracting indices is

A

`n_(2)gtn_(3)gtn_(1)`

B

`n_(3)gtn_(2)gtn_(1)`

C

`n_(3)gtn_(1)gtn_(2)`

D

none of these the specified changes can not occur

Text Solution

Verified by Experts

The correct Answer is:
B
There is a phase change of x when the ray enters from rarer medium into denser medium, the boundary is called rigid boundary and also no change in phase when it enters into rarer medium.
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ALLEN-WAVE OPTICS-Exercise 1 (Check your Grasp)
  1. In YDSE if a slab whose refractive index can be varied is placed in fr...

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  2. In a double slit experiment, instead of taking slits of equal widths, ...

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  3. A ray of light is incident on a thin film, As shown in figure, M and N...

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  4. Let S(1) and S(2) be the two slits in Young's double-slit experiment. ...

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  5. When light is refracted into a medium

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  6. Two point source separated by d=5mum emit light of wavelength lamda=2m...

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  7. Two coherent narrow slits emitting light of wavelength lamda in the sa...

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  8. Minimum thickness of a mica sheet having mu=(3)/(2) which should be pl...

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  9. In the YDSE shown the two slits are covered with thin sheets having th...

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  10. In a YDSE with two identical slits, when the upper slit is covered wit...

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  11. Light wavelength 650 nm is incident normally upon a glass plate the gl...

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  12. Diffraction and interference of light refers to -

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  13. The phenomenon of diffraction of light was discovered by-

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  14. Sound waves shown more diffraction as compare to light rays-

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  15. The conversation going on, in some room, can be heared by the person o...

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  16. Diffraction initiated from obstacle, depends upon the

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  17. Phenomenon of diffraction occurs

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  18. Diffraction of light is observed only, when the obstacle size is-

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  19. which of the following any gives more distinct diffraction

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  20. All fringes of diffraction are of-

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