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- 1.5
- 1.41
- 1.33
- 1.75

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Solution

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The angle of incidence is given as 450

For total internal reflection, the angle of refraction must be 900

For total internal reflection, η×sin45≥1×sin90

⇒n≥√2

⇒n≥1.414

So the possible value of η is 1.5,

Therefore the correct option is B.

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