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What is meant by the ‘angle of incidence’ for a ray of light?

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Question

What is meant by the ‘angle of incidence’ for a ray of light?

Very Short Answer
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Solution

The angle between the incident ray and the normal (at the point of incidence) is called the angle of incidence.

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Chapter 2: Refraction of Light - Exercise 1 [Page 83]

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Lakhmir Singh Physics Part 1 [English] Class 10
Chapter 2 Refraction of Light
Exercise 1 | Q 24. (i) | Page 83

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3 Hypermetropia Change in the direction of the ray of light due to change in medium Spectrum of seven colours

 State the uses of plane mirrors.


The angle of reflection is equal to the angle of incidence:

(a) always
(b) sometimes
(c) under special conditions
(d) never


A man stands 10 m in front of a large plane mirror. How far must the walk before he is 5 m away from his image?


If a ray of light goes form a denser medium to a rarer medium, will it bend towards the normal or away from the normal?


When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?


Fill in the blank and Explain the completed sentences.

The change in ______ of light rays while going from one medium to another is called refraction.


Observe the given figure and name the following.

Ray AB  
Ray NM  
Ray MD  
∠ r  

Explain with diagrams how refraction of incident light takes place from

  1. rarer to denser medium
  2. denser to rarer medium
  3. normal to the surface separating the two media.

Numerical problems.

The speed of light in water is 2.25 × 108 ms–1. If the speed of light in vacuum is 3 × 108 ms–1, calculate the refractive index of water.


The angle of incidence from air to glass at the point O on the hemispherical glass slab is.


Assertion: The air bubble shines in water.
Reason: Air bubble shines due to the refraction of light.


Which is optically denser out of the two medium M1& M2 having the refractive indices = 1.71 and 1.36 respectively?


Why a pencil partly immersed in water appears to be bent at the water surface.


A normal is an imaginary line drawn ________ to the boundary at the point of incidence.


The absolute refractive index of a medium is given by:


In the formula for absolute refractive index \[n = \frac{c}{v}\], the quantity c represents:


A medium with a higher refractive index is:


To a crane, a fish appears 6 cm below the water surface. Taking the refractive index of water as \[\frac{4}{3}\], the real depth of the fish below the surface is:


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