Geometrical OpticsHard
Question
A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45o. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value(s) of n from the following
Options
A.1.3
B.1.4
C.1.5
D.1.6
Solution
For total internal reflection to take place
Angle of incidence, i > critical angle, θc
or sin i > sin θc
or sin 45o >
or
]
or n > √2 or n > 1.414
Therefore, possible values of n can be 1.5 or 1.6 in the given questions.
Angle of incidence, i > critical angle, θc
or sin i > sin θc
or sin 45o >
or
]or n > √2 or n > 1.414
Therefore, possible values of n can be 1.5 or 1.6 in the given questions.
Create a free account to view solution
View Solution FreeMore Geometrical Optics Questions
Which of the following statements about the interstitial compounds is incorrect ?...A person′s near point is 50 cm and his far point is 3 m. Power of the lenses he requires for- (i) reading and (ii)...Focal length of the objective and eye-piece of an astronomical telescope are 20 cm and 10cm. If final image is at the mi...A ray of light passes through four transparent media with refrective indices μ1, μ2, μ3 and μ4 as sh...An object of height 7.5 cm is placed in front of a convex mirror of radius of curvature 25 cm at a distance of 40 cm. Th...