Tag: refractive index

Questions Related to refractive index

The _____________ states that light will follow exactly the same path if its direction of travel is reversed. Fill the appropriate answer.

physics light : reflection and refraction from plane surface principle of reversibility of path of light image formation by plane mirror refractive index

  1. Newton's law of motion

  2. Laws of reflection

  3. Laws of refraction

  4. Principle of reversibility

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Correct Option: D
Explanation:

The principle of reversibility of light :-

Path of ray of light is reversible or light traces back it's path while travelling in reverse direction or a ray of light can pass in either direction along the same path

Note the directions of the arrow.

The beam of light travels back on the same path as it was traveling before the refraction and after the refraction after being encountered by the obstacle in the water.

Principle of reversibility can applied to 

physics light : reflection and refraction from plane surface principle of reversibility of path of light image formation by plane mirror refractive index

  1. Lens system

  2. Mirror system

  3. Lens and mirror system

  4. None of these

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Correct Option: C
Explanation:

Principle of reversibility can applied to both lens and mirror system,
Because the principle is followed by both-Path of ray of light is reversible or light traces back it's path while traveling in reverse direction or a ray of light can pass in either direction along the same path

The refractive index of gias with respect to air is $3/2$ and that of water with respect to air is $4/3$. What is the refractive index of glass with respect to water?

physics light : reflection and refraction from plane surface principle of reversibility of path of light image formation by plane mirror refractive index

  1. $9 : 8$

  2. $1 : 2$

  3. $2 : 1$

  4. $8 : 9$

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Correct Option: A
Explanation:

Given, 


Refractive index of glass=$\dfrac{3}{2}$


Refractive index of water=$\dfrac{4}{3}$

Refractive Index of glass with respect to water= $\dfrac{3/2}{4/3}$
                         =$\dfrac{9}{8}$