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 1

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When a ray of light from air enters a denser medium, it:

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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 2

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incidence is:

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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 highest refractive index is of:

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

The speed of light in air is

3 \times 10^{8} m s^{- 1}

. Calculate the speed of light in glass. The refractive index of glass is

1.5

.

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

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}

).

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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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