When a light ray travels from denser to rarer medium then the angle of incidence for which the angle of refraction becomes is called?

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Ans: Option 3)

CONCEPT:

• Refraction: When a ray of light bounces back from a surface, then it is called a reflection of light.
• Refraction: When a ray of light or wave passes from one medium to another, it deviates from its original path. This deviation is called refraction.
• Critical angle: It is the angle of incidence within the denser medium like which the angle of refraction within the rarer medium is 90°.

EXPLANATION: 

• When a light ray travels from denser medium to rarer medium, at a certain angle of incidence, the angle of refraction becomes 90°. The angle of incidence at this point is called a critical angle.

In the above figure,

i = Angle of Incidence, ic = Critical Angle, and r = Angle of Refraction

In the above figure, we can see that when the angle of refraction becomes 90° then the angle of incidence is called the critical angle.

so,  the value of the angle of refraction at a critical angle is 90°.

The Correct answer is option 3). 

• When the refracted ray bounces back again in the same medium then it is called total internal reflection.
• i.e., The angle of refraction is greater than 90°. 

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