Physics
One should not connect a number of electrical appliances to the same power socket because

this can damage the domestic wiring due to overloading
this can damage the appliances due to overloading
this can damage the electrical meter
the appliance will not get full voltage

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Physics
Purpose of an optical filter is to

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

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