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Correct option is B)

The angle of incidence is given as $45_{0}$

For total internal reflection, the angle of refraction must be $90_{0}$

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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