The primary purpose of polarized sunglasses
a.
to block ultraviolet rays.
b.
to block infrared rays.
c.
to block glare from reflections (for example off lakes or roads).
d.
to look cool.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

hello there!

your answer is a “generator”

a generator does not create energy but instead it transforms it.

it’s basically a motor working in reverse.