Question

2. Draw a neat labeled diagram-partial and total internal reflection ​

Answer 1

Answer:

Total internal reflection happens when a ray of light strikes a medium boundary at an angle greater than a particular critical angle. There are two important condition for TIR to occur. First, the angle of incidence of the light ray must exceed the critical angle at the interface. Second, ray must travels from denser to rarer medium. The angle of incidence above which the total internal occurs is called critical angle.

Explanation:

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Answer 2

The diagram is provided below:

• Consider a ray of light as shown in the diagram journeying from an optically denser medium to a rarer medium. Let it form an angle of incidence 'i' with the normal as shown.
• The possible conditions are:

1. If i < critical angle (ic), part of the incident light is refracted and a part is returned back into the denser medium via reflection.
2. If i = ic, the incident ray grazes along with the interface.
3. If i > ic, the incident light is completely reflected back. This is called total internal reflection.