Physics
Purpose of an optical filter is to

Refract light of different colours
Reflect lights of different colours
Dispense light into component colours
Transmit or absorb light of different colours

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Physics
Which of the following occurred first ?

Wright Brothers successfully flew an aircraft
Max Planck unveiled the Quantum Theory
Guglielmo Marconi sent out the first wireless signals
Albert Einstein propounded the General Theory of Relativity

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