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Light enters from air into a glass plate...

Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass ? `(c = 3 xx 10^(8) ms^(-1) )`

Text Solution

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Given : Refractive index `(mu) = 1.5`
Speed of light in vacuum (c ) `= 2 xx 10^(8) ms^(-1)`
Speed of light in glass `(upsilon) = ?`
Solution :
`mu= ( "Speed of light in vacuum(c )")/("Speed of light in glass" (upsilon) )`
`1.5 = (2 xx 10^(8) ms^(-1) )/(upsilon) rArr upsilon = (2 xx 10^(8) ms^(-1) ) /(1.5 ) = 1.3 xx 10^(8) ms^(-1)`
`therefore` Speed of light in glass `= 1.3 xx 10^(8) ms^(-1)`
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