Physics
It is easier to roll a stone up a sloping road than to lift it vertical upwards because

Work done in lifting the stone is equal to rolling it.
Work done in both is same but the rate of doing work is less in rolling.
Work done in rolling a stone is less than in lifting it.
Work done in rolling is more than in lifting.

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Physics
Purpose of an optical filter is to

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

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