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White light is incident on the interface of glass and air as shown in figure. If green ligth is just totally internally reflected then the emerging ray in air contains

A

yellow, orange, red

B

violet, indigo, blue

C

all colours

D

all colours except green

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The correct Answer is:
A
`underset("V I B G Y O R")rarrmu` decreases
`sinC=1/mu`
As `mu` increases, C decreases.
If green ligth is just totally reflected, violet, indigo, blue will be totally reflected because critical angles for them would be smaller than critical angle for green.
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CP SINGH-REFRACTION OF LIGHT BY PLANE SURFACES-Exercises
  1. A, B and C are three optical media of respective critical angles C1, C...

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  2. A ray of light travelling in water is incident on its surface open to ...

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  3. White light is incident on the interface of glass and air as shown in ...

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  4. Figure shows a mixture of blue, green and red coloured rays incident n...

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  5. An air masked eye placed inside water refractive index, mu sees the ou...

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  6. A fish looking up through the water sees the outside world contained i...

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  7. A point source of light is placed 4m below the surface of a liquid of ...

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  8. A diver in a lake wants to signal his distress to a person sitting on ...

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  9. A light beam is travelling from Region I to IV (figure). The refractiv...

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  10. A transparent solid cylindrical rod has a refractive index of (2)/(sqr...

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  11. Light enters at an angle of incidence in a transparent rod of refracti...

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  12. When light is incident on a medium at angle i and refracted into a sec...

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  13. A rectangular slab ABCD, of refractive index n1 , is immersed in water...

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  14. A ray of light travels from an optically denser to rarer medium. The c...

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  15. A ray of light travels from a medium of refractive index mu to air. It...

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  16. The reason for shining of air bubble in water is

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  17. Which of the following is not due to total internal reflection ?

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  18. Consider telecommunication through optical fibres. Which of the follow...

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  19. Pick out the correct staments about optical fibres from the following:...

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  20. Which of the following options are correct regarding prism?

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