Aptitude Test Problems in Physics Science for Everyone by S Krotov ( PDFDrive.com )

Fig. 234.

298 Aptitude Test Problems in Physics

Fig. 233

cylinder is :02, after refraction will form an angle
a with the cylinder axis such that sin a = 1/n
(according to Snell's law). The angle of incidence cp
of such a ray on the lateral surface of the cylinder

Serer',

satisfies the condition a + = n/2 (Fig. 234).
Since

r1 r
sin a= —. n T

i

5 — < 2 ,

a < n/4 and (1) > n/4, i.e. the angle of incidence
on the lateral surface of the cylinder will be larger
than the critical angle of total internal reflection.