1.

Light travels with a speed of 2 xx 10^(8) m/s in crown glass of refractive index 1.5. What is the speed of light in dense flint glass of refractive index 1.8

Answer»

`1.33 xx 10^(8) m//s`
`1.67 xx 10^(8) m//s`
`2.0 xx 10^(8) m//s`
`3.0 xx 10^(8) m//s`.

SOLUTION :(b) Refractive index `mu = ("Velocity of light in air")/("Velocity of light in MEDIUM")`
`mu_("crown glass")=1.5=(c)/(2XX10^(8))`
For dence FLINT glass `mu = 1.8 = (3 xx 10^(8))/(c_("flint"))`
`c_("flint glass")=(3xx10^(8))/(1.8)=1.67xx10^(8)m//s.`


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