Questions in Ray Optics and Optical Instruments

Select	Question
	Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into
	Critical angle of light passing from glass to air is minimum for
	The wavelength of light in two liquids ‘x' and ‘y' is 3500 Å and 7000 Å, then the critical angle of x relative to y will be
	A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of ${{ heta }^{o}}$ where
	If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is
	A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r’, then the critical angle will be
	For total internal reflection to take place, the angle of incidence i and the refractive index $\mu $ of the medium must satisfy the inequality
	Total internal reflection of light is possible when light enters from
	Total internal reflection of a ray of light is possible when the (${{i}_{c}}$= critical angle, $i=$angle of incidence)
	A diver at a depth of $12m$ in water ($\mu =4/3)$sees the sky in a cone of semi-vertical angle