Assertion `:` In optical fiber, the diameter of the core is kept small.
Reason `:` This smaller diameter of the core ensures that the fiber should have incident angle more than the critical angle required for total internal reflection.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

For smaller diameter incident angle will be greater than critical angle to cause total internal reflection.