Questions in Ray Optics and Optical Instruments

Select	Question
	The splitting of white light into several colours on passing through a glass prism is due to
	A white screen illuminated by green and red light appears to be
	Dark lines on solar spectrum are due to
	Line spectra are due to
	The path of a refracted ray of light in a prism is parallel to the base of the prism only when the
	For a medium, refractive indices for violet, red and yellow are 1.62, 1.52 and 1.55 respectively, then dispersive power of medium will be
	Two lenses having ${{f}_{1}}:{{f}_{2}}=2:3$ has combination to make no dispersion. Find the ratio of dispersive power of glasses used
	If refractive index of red, violet and yellow lights are 1.42, 1.62 and 1.50 respectively for a medium. Its dispersive power will be
	A ray is incident at an angle of incidence $i$ on one surface of a prism of small angle $A$ and emerges normally from the opposite surface. If the refractive index of the material of the prism is $\mu $, the angle of incidence $i$ is nearly equal to
	Fraunhofer spectrum is a