Questions in Ray Optics and Optical Instruments

Select	Question
	The angle of a prism is 60° and its refractive index is $\sqrt{2}$. The angle of minimum deviation suffered by a ray of light in passing through it is
	Colour of the sky is blue due to
	Which of the following spectrum have all the frequencies from high to low frequency range
	Stars are not visible in the day time because
	Which of the following colours suffers maximum deviation in a prism
	If a thin prism of glass is dipped into water then minimum deviation (with respect to air) of light produced by prism will be left $\left( _{a}{{\mu }_{g}}=\frac{3}{2}\text{ and}{{\,}_{a}}{{\mu }_{w}}\,=\,\frac{4}{3} \right)$
	The refractive indices for the light of violet and red colours of any material are 1.66 and 1.64 respectively. If the angle of prism made of this material is $10^o$, then angular dispersion will be
	The refractive index of the material of the prism for violet colour is 1.69 and that for red is 1.65. If the refractive index for mean colour is 1.66, the dispersive power of the material of the prism
	The deviation caused in red, yellow and violet colours for crown glass prism are $2.84^o$, $3.28^o$ and $3.72^o$ respectively. The dispersive power of prism material is
	Dispersion of light is due to