Assertion -A ray is incident from outside on a glass sphere surrounded by air as shown in fig- This ray may suffer total internal reflection the second interface- Reason- For a ray going from a denser to rarer medium- the ray may suffer total internal reflection-Both Assertion and Reason are correct and Reason is the correct explanation AssertionBoth Assertion and Reason are correct but Reason is not the correct explanation AssertionAssertion is correct but Reason is incorrectAssertion is incorrect but Reason is correct

Question

Toppr Admin · Accepted Answer

Refraction at both the surfaces appears as shown in the figure.
From geometry we see that both the angles from normal inside the sphere are equal(r). This results from being angles opposite to equal sides of a triangle.
Applying Snell's Law at both the surfaces gives,
$sin i = μ sin r$ (Surface 1)
$μ sin r = sin e$ (Surface 2)
Hence we see $i = e$ which means that total internal reflection does not take place.
However, Statement 2 is true. Total internal reflection takes place when a ray of light goes from denser to rarer medium, when incident with an angle greater than a critical angle. But this does not take place in the above case.