Which of the following is/are application(s) of optical fibres?

The correct answer is Option (4) → All of these

An optical fibre carries light along its length by repeated total internal reflection, with very little loss. Bundles of fibres carry light signals and pictures, electrical signals are sent through them after being converted into light by transducers, and doctors use them as light pipes to view internal organs in endoscopy. All three uses are correct.