Assertion (A) : In optical fibre, the diameter of the core is kept sma

1.	Assertion (A) : In optical fibre, the diameter of the core is kept small Reason (R) : The small diameter of the core ensures that the fibre should have inside it an angle greater than critical angle needed for total internal reflection(a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is NOT the correct explanation of A (c) A is true but R is false (d) A is false and R is also false
Answer» Option : (A) Both, the Assertion and Reason are two and later explains the former correctly. Total internal reflection of light takes place if angle of incidence is greater than critical angle. So, small diameter ensures that incident light falls at an angle greater than critical angle.

Assertion (A) : In optical fibre, the diameter of the core is kept small Reason (R) : The small diameter of the core ensures that the fibre should have inside it an angle greater than critical angle needed for total internal reflection(a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is NOT the correct explanation of A (c) A is true but R is false (d) A is false and R is also false

Answer»

Option : (A)

Both, the Assertion and Reason are two and later explains the former correctly.

Total internal reflection of light takes place if angle of incidence is greater than critical angle.

So, small diameter ensures that incident light falls at an angle greater than critical angle.

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