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Acids, Bases And Salts

Question
CBSEENSC10014727
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The absolute refractive indices of glass and water are 4/3 and 3/2, respectively. If the speed of light in glass is 2 × 108m/s, calculate the speed of light in,

a) vacuum
b) water

Solution

Refractive index of glass, straight eta subscript straight g= 3/2
Therefore,
straight eta subscript straight g space equals space fraction numerator Speed space of space light space in space vacuum over denominator Speed space of space light space in space glass end fraction 3 over 2 space equals space fraction numerator Speed space of space light space in space vacuum over denominator 2 space straight x space 10 to the power of 8 end fraction
That is,
Speed of light in vacuum,
c = fraction numerator 3 space straight x 2 space straight x space 10 to the power of 8 over denominator 2 end fraction space equals space 3 space x space 10 to the power of 8 space m divided by s
Refractive index of water, straight eta subscript straight w space equals space 4 over 3
straight eta subscript straight w space equals space fraction numerator Speed space of space light space in space vacuum over denominator Speed space of space light space in space water end fraction
4 over 3 equals fraction numerator 2.6 space x space 10 to the power of 8 over denominator S p e e d italic space o f italic space l i g h t italic space i n italic space w a t e r end fraction
Speed of light in water = 2.25 x 108 m/s
Note: In the question given, the refractive indices of glass and water is wrong. The refractive index of glass and water is interchanged.

Some More Questions From Acids, Bases and Salts Chapter

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What are real and virtual images? Can these images be obtained on a screen? Give reasons in support of your answer.

Give three points of differences between real and virtual images.

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Incident ray, reflected ray, point of incidence, normal, angle of incidence and angle of reflection.

State the laws of reflection of light.

Are the laws of reflection applicable to plane surfaces also valid for curved surfaces?

State the important properties of images formed by plane mirrors.

What is lateral inversion of an image ? What is the cause of lateral inversion?

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