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When light is refracted into a medium...

When light is refracted into a medium

A

its wavelength and frequency both increase

B

its wavelength increases but frequency remains unchanged

C

its wavelength decreases and frequency increases

D

its wavelength and frequency both decrease

Text Solution

Verified by Experts

The correct Answer is:
B
Accoding to Snell.s law `(sini)/(sinr)=(v_(1))/(v_(2))=(mu_(2))/(mu_(1))`
From fig. we see that
`r gt i`
So `v_(2)=n lambda_(2) gt v_(1)=n lambda_(1)`
`rArr lambda_(2) gt lambda_(1)`

(Frequency of wave does not change on refraction)
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Knowledge Check

  • When a light ray is refracted from one medium into another, the wavelength changes from 4500overset(o)(A) to 3600overset(o)(A) . The critial angle for a ray from second medium to first medium is

    A
    `sin^(-1)(2/13)`
    B
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    C
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    D
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    A
    Speed increases, wavelength increases
    B
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    C
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    D
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  • When light is incident on a medium of refractive index mu from rarer medium at an angle 'i' and is refracted at an angle 'r', then Snell's law gives

    A
    `mu=(sin i)/(sin r)`
    B
    `mu=(sin r)/(sin i)`
    C
    `mu=sin ixxsin r`
    D
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