To study refraction of light in rectangular glass slab (Self Evaluation) : Class 10 : Physics : C-DAC Online Lab

	1)	A ray of light incident on one of the parallel faces of a rectangular glass slab, emerges out of the opposite parallel face
		along the same straight line as the incident ray parallel to the incident ray but laterally displaced inclined to the incident ray gets absorbed into the body of the glass slab and does not emerge out of it

The path of a ray of light passing through a rectangular slab was traced and angles measured. Which one out of the following is the correct representation of an angle of incidence i, angle of refraction r and angle of emergence e as show in the diagrams

	3)	Why does bending of light takes place ?
		Because light travels with same velocity in different media Because it travels with different velocity in different media None of these

	4)	In which direction does a ray bend when it travels from a denser medium to a rarer medium :
		It bends away from the normal as it meets the surface of rarer medium It bends towards the normal as it meets the surface of rarer medium It goes straight None of these

	5)	Refractive index is the property of :
		One medium The pair of media One vacuum None of these

	6)	Does the refractive index of substance change with the colour of light ?
		No, refractive index does not depend upon the colour of light (wavelength) Yes, refractive index depends upon the colour of light (wavelength) None of these

	7)	Give the example of total internal reflection :
		Mirage (Mrig Trishna), generally observed in deserts in summer Looming, generally observed in cold region Both of these

	8)	What is critical angle ?
		Critical angle is the angle of incidence for which angle of refraction is 45 degree when light travels from denser medium to rarer Is the angle of incidence for which angle of refraction is 90 when light travels from rarer to denser medium Is the angle of incidence for which angle of refraction is 90 when light travels from denser to rarer medium None of these

	9)	What is the advantage of "total internal reflection" over reflection ?
		Total internal reflection is an interesting phenomenon than reflection Loss of intensity of light is less in total internal reflection than reflection None of these

	10)	What do you mean by the statement "Refractive Index of glass is 1.5"
		It means refractive index of glass with respect to air is 1.5 Refractive index of air with respect to glass is 1.5 It means refractive index of glass with respect to water is 1.5 None of these