When a beam of light enters a piece of plexiglass, what will be its path? (np > 1)

1
Light (em radiation) of wavelength 2 microns
is A gamma ray B x-ray C visible D
infrared E microwave
2
Light (em radiation) of wavelength 2 cm is A
ultraviolet B visible C infrared D
microwave E radiowave
3
When a beam of light enters a piece of
plexiglass, what will be its path? (np gt 1)
4
The wave equation is time-reversal symmetric.
A laser in air shines a beam of light that hits a
diver, rightmost path. The diver has a laser
pointer, and wants to hit the air laser. What
direction should he point it? Or choose D no
direction will work.
5
Enter the following numbers on the scantron, to
one sig fig, in the formata1 x 10a2
12 19 34 0.133e8 56 1.7889 78
577 x 102