Flash Card
When a ray of light enters a rarer medium from a denser medium, for a particular value of i for which, the value of r becomes equal to 90°, is called the ..............angle.
............. coloured ray deviates the least during the dispersion of light through a prism.
For the refraction of light through a glass slab angle of incidence is .............. angle of emergence.
What is the reason for the twinkling of stars?
Coin placed at the bottom of vessel when viewed from sides becomes visible only after filling water upto certain height. This is due to phenomenon of ........ .
The speed of light in air is
The velocity of light is ............. in different media.
Dispersion of light and mirage are two examples of the phenomenon where ............ takes place.
Which of the following cannot be used to study refraction?
Which of the following light source cannot produce dispersion?
An illusion of the appearance of water on a hot road or in a desert is an example of
A laser beam enters from air to soap solutions in water then ................ .
When a light ray makes an angle of 90° while entering a glass slab from air, it
The refractive index of hot air is
A light ray is entering glass from water,
Choose the correct statement regarding the incident ray, refracted ray and normal drawn at the point of incidence.
We can see the sun even when it is little below the horizon because of ............ .
Refractive index depends on the
Substances in the order of optically denser to optically rarer medium are:
How to convert light dispersed by prism again into white light?
During refraction of light through the glass slab refraction of light takes place ........... in a glass slab.
Light changes its direction when going from one transparent medium to another transparent medium. This is called ............ .
During formation of mirage, the density of air
............. is formed as the combined effect of the refraction, dispersion, and internal reflection
Which of the following remains unchanged during refraction of light?
The actual position of star is slightly ........... than apparent position of star
For a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is.............. .
The unit of refractive index is
The process of separation of light into its component colour while it is passing through a medium is called
If the first medium is vacuum then the refractive index of medium 2 is called .............. .
............. coloured ray deviates the most during the dispersion of light through a prism.
A ray of light makes an angle of 50° with the surface S1 of the glass slab. Its angle of incidence will be............... .
When a ray of light enters a rarer medium from a denser medium, it gets partially reflected i.e. part of the light gets reflected and comes back into the denser medium obeying the laws of reflection. This is called .................. reflection.
Mirage is the effect of atmospheric .......... on a small scale.
