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Mark the Correct Answer in The Question. If the Refractive Index of Glass with Respect to Air is 3/2, What is the Refractive Index of Air with Respect to Glass? - Science and Technology 1

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प्रश्न

Mark the correct answer in the  question.

 If the refractive index of glass with respect to air is 3/2, what is the refractive index of air with respect to glass?

पर्याय

  •  \[\frac{1}{2}\]

  • 3

  • \[\frac{1}{3}\]

  •  \[\frac{2}{3}\]

MCQ

उत्तर

\[{}{a}{\mu}_g = \frac{\mu_g}{\mu_a} = \frac{3}{2}\]

where,

\[{}{a}{\mu}_g = \text{ Refractive index of glass w . r . t . air } \]

\[ \mu_g =\text{  Refractive index of glass } \]

\[ \mu_a = \text{ Refractive index of air } \]

Thus, 

\[{}{g}{\mu}_a = \frac{\mu_a}{\mu_g} = \frac{2}{3}\]
where, 
 
\[{}{g}{\mu}_a = \text{ Refractive index of air w . r . t . glass } \]
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पाठ 6: Refraction of light - Exercises [पृष्ठ ७९]

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बालभारती Science and Technology 1 [English] 10 Standard SSC Maharashtra State Board
पाठ 6 Refraction of light
Exercises | Q 3.3 | पृष्ठ ७९

संबंधित प्रश्‍न

How refraction of light is related to refractive index?


The velocity of light in a medium is 1.5 x 108 m/s. What is the refractive index of the medium with respect to air, if the velocity in air is 3 x 108 m/s?


A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?


Find out, from Table, the medium having highest optical density. Also find the medium with lowest optical density.

Material medium Refractive index Material medium Refractive index
Air 1.0003 Canada Balsam 1.53
Ice 1.31
Water 1.33 Rock salt 1.54
Alcohol 1.36
Kerosene 1.44 Carbon disulphide 1.63
Fused quartz 1.46 Dense flint glass 1.65
Turpentine oil 1.47 Ruby 1.71
Benzene 1.50 Sapphire 1.77
Crown glass 1.52 Diamond .42

The speed of light in air is:

(a) 3 × 108 cm/s
(b) 3 × 108 mm/s
(c) 3 × 108 km/s
(d) 3 × 108 m/s


Refractive indices of carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively. Which is optically denser?


Fill in the following blank with a suitable word:
When a ray of light goes from air into a clear material, you see the ray bend. How much the ray bends is determined by the ............... of the material. 

 


Define Snell's law of refraction. A ray of light is incident on a glass slab at an angle of incidence of 60°. If the angle of refraction be 32.7°, calculate the refractive index of glass. (Given : sin 60° = 0.866, and sin 32.7° = 0.540).


What is the speed of light in a medium of refractive index `6/5` if its speed in air is 3,00,000 km/s?


 What is meant by the refractive index of a substance?


Light travels through air at 300 million ms−1. On entering water it slows down to 225 million ms−1. Calculate the refractive index of water.


The refractive indices of four substance P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance: 

(aP
(bQ
(cR
(d


The refractive index of glass for light going from air to glass is .

The refractive index for light going from glass to air will be:

(a) `1/3`

(b) `4/5`
(c) `4/6` 
(d) `5/2`


The refractive indexes of four substances P, Q, R and S are 1.77, 1.50, 2.42 and 1.31 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in:

(a) substance P
(b) substance Q
(c) substance R
(d) substance S


The refractive index of water with respect to air is `4/3`. The refractive index of air with respect to water will be:

(a) 1.75
(b) 0.50
(c) 0.75
(d) 0.25


The following table gives the refractive indices of a few media: 

  1 2 3 4 5
Medium  Water Crown glass Rock salt Ruby Diamond
Refractive index 1.33 1.52 1.54 1.71 2.42
 

Use this table to give an example of:

(i) a medium pair so that light speeds up when it goes from one of these medium to another.
(ii) a medium pair so that light slows down when it goes from one of these medium to another.


State the laws of refraction of light. Explain the term 'absolute refractive index of a medium' and write an expression to relate it with the speed of light in vacuum.


State Snell’s law of refraction of light. Write an expression to relate refractive index of a medium with speed of light in vacuum.

The refractive index of a medium ‘a’ with respect to medium ‘b’ is 2/3 and the refractive index of medium ‘b’ with respect to medium ‘c’ is 4/3. Find the refractive index of medium ‘c’ with respect to medium ‘a’.


Prove the statement.

 If the angle of incidence and angle of emergence of a light ray falling on a glass slab are i and e respectively, prove that, i = e.


If in a medium, the speed of light is 1.5 × 108 m/s how much will the absolute refractive index of that medium be?


Solve the example.

If the absolute refractive indices of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?


Light travels with a velocity 1.5 x 108 m/s in a medium. On entering second medium its velocity becomes 0.75 x 10 m/s. What is the refractive index of the second medium with respect to the first medium?


If the refractive index of air with respect to glass is 2/3. What is the refractive index of glass with respect to air?


Purple has the lowest refractive index.


If the absolute refractive index of glass and water are 3/2 and 4/3 respectively, what is the refractive index of glass with respect to water?


Define the refractive index of a medium.


A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be ______.


Refractive index of diamond with respect to glass is 1.6 and absolute refractive index of glass is 1.5. Find out the absolute refractive index of diamond.


How is the refractive index of material related to the velocity of light?


What happens when a light ray passes from a rarer medium to a denser medium?


A light ray enters from medium A to medium B as shown in the figure.

Which one of the two media is denser w.r.t. other medium? Justify your answer.


A light ray enters from medium A to medium B as shown in the figure.

If the speed of light in medium A is `v_a` and in medium B is `v_b`, what is the refractive index of B with respect to A.


Absolute refractive indices of diamond and water are 2.42 and 1.33 respectively. Find the value of refractive index of water w.r.t. diamond.


The ability of medium to refract light is expressed in terms of its optical density. Optical density has a definite connotation. It is not the same as mass density. On comparing two media, the one with the large refractive index is optically denser medium than the other. The other medium with a lower refractive index is optically rarer. Also the speed of light through a given medium is inversely proportional to its optical density.
  1. Determine the speed of light in diamond if the refractive index of diamond with respect to vacuum is 2.42. Speed of light in vacuum is 3 × 108 m/s. 
  2. Refractive indices of glass, water and carbon disulphide are 1.5, 1.33 and 1.62 respectively. If a ray of light is incident in these media at the same angle (say θ), then write the increasing order of the angle of refraction in these media. 
  3. (A) The speed of light in glass is 2 × 108 m/s and is water is 2.25 × 108 m/s.
    (a) Which one of the two optically denser and why?
    (b) A ray of light is incident normally at the water glass interface when it enters a thick glass container filled with water. What will happen to the path of the ray after entering the glass? Give reason. 
    OR
    (B) The absolute refractive indices of glass and water are 4/3 and 3/2, respectively. If the speed of light in glass is 2 × 108 m/s, calculate the speed of light in (i) vacuum (ii) water.

  1. Explain why the refractive index of any material with respect to air is always greater 1.
  2. In the figure below a light ray travels from air into the semi-circular plastic block. Give a reason why the ray does not deviate at the semi-circular boundary of the plastic block.
  3. Complete the ray diagram of the above scenario when the light ray comes out of the plastic block from the top flat end.

Absolute refractive indices of glass and water are `3/2 and 4/3` respectively. If the speed of light in glass is 2 × 108 m/s, the speed of light in water is ______.


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