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Laws of Refraction

A ray of ligh...

Question

A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. What will happen to light when it strikes surface PQ?

A

It will undergo regular refraction

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B

It will undergo critical phenomenon

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C

It will undergo Total internal refraction

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D

It will undergo Total internal reflection

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Solution

The correct option is D
It will undergo Total internal reflection

The required ray diagram is shown below:

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