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When a ray of light enters a glass slab ...

When a ray of light enters a glass slab from air

A

its wavelenght decreases

B

its wavelenght increases

C

its frequency increases

D

neither is wavelenght nor its frequency changes

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
Wavelenght , `lambda = ("Velocity")/("Frequency") = (u)/(v)`
When light travels from air to glass, frequency v remains unchanged, velocity u decreases and hence wavelenght `lambda` also decreases.
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Knowledge Check

  • when a ray of light enerts a glass slab, then

    A
    its frequency and velocity change
    B
    only frequency changes
    C
    its frequency and wavelenght change
    D
    its frequency does not change

  • When a ray of light entes glass from water, it bends ____________.

    A
    towards the normal due to decrease in the speed of light
    B
    towards the normal due to increase in the speed of light
    C
    Away from the normal due to increase in the speed of light
    D
    Away from the normal due to decrease in the speed of light.

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    A
    bends towards the normal
    B
    bends away from the normal
    C
    passes without bending
    D
    reflects to air

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