The refractive index of water with respect to air is 4 3 . What is the refractive index of air with respect to water?

Given that, The refractive index of water with respect to air is η w = 4 3 . We know that the refractive index of water with respect to air is the reciprocal of the refractive index of air with respect to water. Thus, the refractive index of air with respect to water is η a = 1 η w = 1 4 3 = 3 4 = 0 . 75 .

A ray of light of wavelength 5400 Å suffers refraction from air to glass. Taking η g a = 3 2 , find the wavelength of light in glass.

Given, The refractive index of glass with respect to air is η g a = 3 2 . The wavelength of light in air is λ = 5400 Å = 5400 × 10 - 10 m . Speed of light in air is c = 3 × 10 8 m s - 1 . So, the frequency of light which remains the same while traveling to another mediums also is f = c λ = 3 × 10 8 m s - 1 5400 × 10 - 10 m = 5 . 56 × 10 14 Hz . Now, the speed of light in glass is v g = c η g a = 3 × 10 8 m s - 1 3 2 = 2 × 10 8 m s - 1 . Thus, the wavelength of light in glass is λ g = v g f = 2 × 10 8 m s - 1 5 . 56 × 10 14 Hz = 0 . 36 × 10 - 6 m = 3600 × 10 - 10 m = 3600 Å .

E M B I B E

Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(A)>Q 2

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The speed of light in diamond is $125, 000 km s^{- 1}$ . What is its refractive index? (speed of light in air $= 3 \times 10^{8} m s^{- 1}$ ).

Important Questions on Refraction of Light at Plane Surfaces

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(A)>Q 3

The refractive index of water with respect to air is

\frac{4}{3}

. What is the refractive index of air with respect to water?

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(A)>Q 4

A ray of light of wavelength

5400 Å

suffers refraction from air to glass. Taking

{}_{a}η_{g} = \frac{3}{2}

, find the wavelength of light in glass.

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(B)>Q 1

What is a prism? With the help of a diagram of the principal section of a prism, indicate its refracting surfaces, refracting angle and base.

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(B)>Q 2

Diagrams (a) and (b) in the figure below show the refraction of a ray of light of single colour through a prism and a parallel sided glass slab respectively. In each diagram, label the incident, refracted, emergent rays and the angle of deviation.

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(B)>Q 2

Diagrams (a) and (b) in the figure below show the refraction of a ray of light of single colour through a prism and a parallel sided glass slab respectively. In what way the direction of the emergent ray in the two cases differ with respect to the incident ray? Explain your answer.

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(B)>Q 3

Define the term angle of deviation

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(B)>Q 5

What do you understand by the deviation produced by a prism? Why is it caused? State three factors on which the angle of deviation depends.

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Selina Icse Concise Physics For Class 10>Chapter 4 - Refraction of Light at Plane Surfaces>EXERCISE-4(B)>Q 6

How does the angle of deviation produced by a prism change with increase in the angle of incidence. Draw a curve showing the variation in the angle of deviation with the angle of incidence at a prism surface.