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