Exams › NEET › Physics

Assertion Optical fibres are used to transmit light without any appreciable loss in its intensity over distance of several kilometers. Reason Optical fibres are very thick and all the light is passed through it without any loss.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Correct answer: Assertion is correct but Reason is incorrect

Solution

Optical fibres guide light by repeated total internal reflection, so the signal can travel kilometers with very little loss. The reason is wrong because fibres are not thick, and some loss still occurs; the low loss is due to their optical design, not because all light passes through perfectly.

Related NEET Physics questions

• Which of the following statement regarding transformer is incorrect?
• Electric current flows through:
• A particle of mass \( m \) is made to move with uniform speed \( v \) along the perimeter of a regular hexagon. The magnitude of impulse applied at each corner is:
• According to Stoke's law, the viscous drag force, on an oil drop is proportional to:
• was the first to discover that lightning is electric discharge.
• Assertion Newton's law of gravitation resembles Coulomb's law of electrical forces. Reason Coulomb's law has the product of two charges in place of the product of the masses, and the electrostatic constant in place of the gravitational constant.

⚔️ Practice NEET Physics free + battle 1v1 →