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Calculate speed of light in water of ref...

Calculate speed of light in water of refractive index `4//3`. Given speed of light in air `= 3 xx 10^(8) m//s`.

Text Solution

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The correct Answer is:
The speed of light in water is `2.25xx10^(8) m//s`.
Given : Refractive index of water `(""_(2)n_(1))=(4)/(3)`, Speed of light in air `(v_(1))=3xx10^(8) m//s`
To find: Speed of light in water `(v_(2))`
Formula: `""_(2)n_(1)=(v_(1))/(v_(2))`
Calculation: From formula,
`""_(2)n_(1)=(v_(1))/(v_(2))`
`therefore" "v_(2)=3xx10^(8)xx(3)/(4)=(9)/(4)xx10^(8)`
`=2.25xx10^(8) m//s`
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