Question

PLEASE FILL THE BITS

(1) optical fibers employ total___________________.

(2)when a light ray enters glass slab from air , the angle of refraction is __________________angle of incidence.

(3)to observe total internal reflection we need to have incident angle to be greater than _______________________.


CHOOSE THE CORRECT ANSWER

(1) the refractive index of a medium , given that its critical angle is 45 degrees

(a) 1.414 (b) 1.732
(c) 1.3 (d) 2.42

Answer 1

Total internal reflection. Is less than. 90 degrees

Answer 2

the angle of refraction is equal to angle of incidence