Q. A TRIAC (Triode alternating current) cannot perform switching action on DC voltage.

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Q. Who developed the first Light emitting diode?

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Q. Who was/were awarded with noble prize in physics in the year 2014 for the invention of blue light emitting diodes?

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Q. Which alloy is used for green blue and white LED’s?

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Q. Which alloy is used for red, orange and yellow LED’s?

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Q. Recombination of charge carriers in an LED, releases some energy which comes out in the form of light.

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Q. Opto-isolator uses a source of light for transmission, most commonly “near infrared light emitting diodes”.

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Q. LASER stands for ____

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Q. Which is a type of Opto-isolator?

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Q. Optical isolator is also called as ________

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Q. Which electromagnetic rays is emitted GaAs LED’s ?

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Q. Who is known as the father of fibre optics?

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Q. Which layer is just present above core that protects the light from going outside?

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Q. Which layer is just present above cladding that protects the optical fibre from physical damage?

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Q. What is the working principle of optical fiber?

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Q. The critical angle in total internal reflection depends on the colour of the incident light.

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