Year: 2019
Topic: Ray optics and optical instruments
Time :
1.
In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?
(1). \(0^\circ\)
(2). Equal to angle of incidence
(3). \(90^\circ\)
(4). \(180^\circ\)