Physics
A photostat machine works on

Electrostatic image making
Magnetic image making
Thermal image making
Electromagnetic image making

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

No radiation of heat takes place
Air layer between two shirts behaves like insulating media
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor

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

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

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