SATHEE: Optics Question 734

Optics Question 734

Question: Refractive index of glass is $\frac{3}{2}$ and refractive index of water is $\frac{4}{3}$ . If the speed of light in glass is $2.00 \times 10^{8}$ m/s, the speed in water will be

[MP PMT 1994; RPMT 1997]

Options:

A) $2.67 \times 10^{8}$ m/s

B) $2.25 \times 10^{8}$ m/s

C) $1.78 \times 10^{8}$ m/s

D) $1.50 \times 10^{8}$ m/s

Show Answer

Answer:

Correct Answer: B

Solution:

$μ \propto \frac{1}{v} \Rightarrow \frac{μ_{g}}{μ_{w}} = \frac{v_{w}}{v_{g}} \Rightarrow \frac{3 / 2}{4 / 3} = \frac{v_{w}}{2 \times 10^{8}}$

$\Rightarrow v_{w} = 2.25 \times 10^{8} m / s$

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Optics Question 734

Question: Refractive index of glass is 32 and refractive index of water is 43 . If the speed of light in glass is 2.00×108 m/s, the speed in water will be

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Question: Refractive index of glass is $\frac{3}{2}$ and refractive index of water is $\frac{4}{3}$ . If the speed of light in glass is $2.00 \times 10^{8}$ m/s, the speed in water will be