Questions in Ray Optics and Optical Instruments

Select	Question
	If the refractive indices of crown glass for red, yellow and violet colours are respectively ${{\mu }_{r\,}},\,\,{{\mu }_{y}}$ and ${{\mu }_{v}}$, then the dispersive power of this glass would be
	The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then
	When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is or Deviation by a prism is lowest for
	We use flint glass prism to disperse polychromatic light because light of different colours
	A prism $(\mu =1.5)$ has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36’ = 0.75)
	Fraunhofer lines are obtained in
	When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is $\sqrt{2}$, then the angle of prism will be
	A spectrum is formed by a prism of dispersive power $'\omega '$. If the angle of deviation is $'\delta '$, then the angular dispersion is
	Light from sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consists of
	Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is (cos 41° = 0.75)