Advertisements
Advertisements
प्रश्न
How are critical angles related to the refractive index of the medium?
Advertisements
उत्तर
APPEARS IN
संबंधित प्रश्न
State the conditions required for total internal reflection of light to take place
What is total internal reflection?
Total internal reflection occurs only when a ray of light passes from a ______ medium to a ______ medium.
Swarali has got the following observations while doing an experiment. Answer her questions with the help of observations.
Swarali observed that the light bent away from the normal, while travelling from dense medium to rarer medium. When Swarali increased the values of angle of incidence (i), the values of angle of refraction (r) went on increasing. But at a certain angle of incidence, the light rays returned into the dense medium.
So, Swarali has some questions. Answer them –
a) Name this certain value of ‘i ’. What is the value of ‘r’ at that time ?
b) Name this process of returning of light in dense medium. Explain the process.
Plot a graph between
Angle of incidence versus angle of refraction.
State one factor on which a critical angle for a given pair of media depends. The critical angle for the glass-air interface is 45° for the yellow light. Will it be equal to, less than or greater than 45° for (i) red light, (ii) blue light?
For the same angle of incidence, the angle of refraction in four media A, B, C and D are 25°, 30°, 35° and 40° respectively. The speed of light is least in medium ______.
The angle of incidence at which the angle of refraction is Q£ is called the critical angle.
Write any two uses of total internal reflection.
What are the examples of total internal reflection in nature?
