Question

4.
Photo diodes are used to detect
(a) radio waves
(c) IR rays
gamma rays
(d)
optical signals

5.
The relationship between Brewster angle 8 and the speed of light u in the
denser medium is
(a) c cos 0 = v
(b) v tan 0 = c
(c) c = v tane
(d) u cos 0 = 0​

Answer 1

Explanation:

4.( d ) optical signals

5 . don't know SORRY