Physics
Purpose of an optical filter is to

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

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Physics
Should cars have bumpers that collapse under impact?

No, since the colliding car would then ram into the occupants and kill them
No, since it would be very expensive to get the car repaired
Yes, since they help to absorb the impact of a collision and keep the occupants safe
Yes, since the offending car should get damaged and pay for the mistake

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