Answer:
Explanation:
Critical angle represent the angle at which the refracted ray is 90°, this angle is the smallest and if this angle is increase above this value; instead of refraction we will have total internal reflection. It occurs when light travels from an optically denser medium to an optically less dense medium.
nā sin i = nā sin r using Snell's law where i represent incidence angle and r represent refracted angle
nā sin C = nā sin 90°
C = sinā»Ā¹ ( nā / nā)
for water and air
C = Ā sinā»Ā¹ ( 1 / 1.33) = 48.75°
for diamond and air
C = sinā»Ā¹ ( 1 / 2.42 ) = 24.41°
for diamond and water
C= sinā»Ā¹ ( 1.33 / 2.42) = 33.33°
and benzene and water
C = Ā sinā»Ā¹ ( 1.33 / 1.50) = 62.46°
ranking from largest to smallest : n1benzene=1.50, n2water=1.33, followed n1water=1.33, n2air=1.00, followed by n1diamond=2.42, n2water=1.33 and finally the smallest is n1diamond=2.42, n2air=1.00