Questions in Ray Optics and Optical Instruments

Select	Question
	A ray of light is incident normally on one of the face of a prism of angle $30^o$ and refractive index $\sqrt{2}$. The angle of deviation will be
	For a prism of refractive index 1.732, the angle of minimum deviation is equal to the angle of the prism. The angle of the prism is
	The spectrum obtained from an electric lamp or red hot heater is
	When a glass prism of refracting angle $60^o$ is immersed in a liquid its angle of minimum deviation is $30^o$. The critical angle of glass with respect to the liquid medium is
	Three prisms 1, 2 and 3 have the prism angle $A = 60^o$, but their refractive indices are respectively 1.4, 1.5 and 1.6. If $\delta _1, \delta _2, \delta _3$ be their respective angles of deviation then
	Which one of the following alternative is FALSE for a prism placed in a position of minimum deviation
	In the visible region the dispersive powers and the mean angular deviations for crown and flint glass prisms are $\omega \omega ‘$and $d, d’$ respectively. The condition for getting deviation without dispersion when the two prisms are combined is
	A ray of light passes through the equilateral prism such that angle of incidence is equal to the angle of emergence if the angle of incidence is $45^o$. The angle of deviation will be
	The solar spectrum during a complete solar eclipse is
	Why sun has elliptical shape on the time when rising and sun setting ? It is due to