Questions in Ray Optics and Optical Instruments

Select	Question
	Critical angle is that angle of incidence in the denser medium for which the angle of refraction in rarer medium is
	The critical angle for diamond (refractive index = 2) is
	The reason for shining of air bubble in water is
	With respect to air critical angle in a medium for light of red colour $[{{\lambda }_{1}}]$ is $\theta $. Other facts remaining same, critical angle for light of yellow colour $[{{\lambda }_{2}}$] will be
	'Mirage' is a phenomenon due to
	A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of 45°. 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
	When a ray of light emerges from a block of glass, the critical angle is
	The phenomenon utilised in an optical fibre is
	The refractive index of water is 4 / 3 and that of glass is 5/3. What will be the critical angle for the ray of light entering water from the glass
	Total internal reflection is possible when light rays travel