A football team wears a yellow shirt and white shorts. What would the kit look like: a. in red light?
b. in green light?
c. in blue light?

In all three cases . . .

-- the shirt appears black, since there's no yellow light shining on it;

-- the shorts appear to have the same color as the light shining on them.

c)as speed changes, wavelength and frequency change.

everything changes!

magnified images possible images can be real = projected onto a screen