Physics
Which of the following is not a part of a CRT ?

Electron gun
Phosphor screen
Gas plasma
Shadow mask

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Physics
What is refractive index ?

It is defined as the product of speed of light in medium and in vacuum.
None of above
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

All radiations from sun initiate chemical reactions in eyes
Cosmic rays reach eyes more during the eclipse
Ultraviolet radiations from Sun burn our retina
Infrared radiations from sun burn our retina

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