Advertisements
Advertisements
प्रश्न
(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.
Advertisements
उत्तर
(i) The angle of incidence for which the angle of refraction is 90o is called critical angle.
`"_1 mu _2 = (sin i_c)/(sin (90^circ))`
`therefore (mu_2)/(mu_1) = (sini_c)/(1)`
` therefore 1/mu = sini_c " If " mu_2 = 1 mu_1 = mu`
` therefore i_c = sin^(-1) (1/mu)`
(ii) Relative refractive of the medium `("_1 mu_2)`1
APPEARS IN
संबंधित प्रश्न
Name two factors which affect the critical angle for a given pair of media. State how do the factors affect it.
Why do diamonds sparkle?
Write down the relationship between the critical angle and the refractive index of the medium.
A ray of light incident at an angle of incidence ‘i’ passes through an equilateral glass prism such that the refracted ray inside the prism is parallel to its base and emerges from the prism at an angle of emergence ‘e’.
How is the angle of emergence ‘e’ related to the angle of incidence ‘i’?
Draw a diagram, properly labelled, to illustrate the use of a total reflecting prism (a right-angled isosceles prism) to turn a ray of light through 180°. Name an instrument in which this device is used.
The adjacent diagram shows two right-angled isosceles prisms A and B. Complete the diagram to show the path of rays P and Q emerging out of the prism B. What principles have you used to complete the diagram?
Write any two uses of total internal reflection.
A jar of height h is filled with a transparent liquid of refractive index µ (Figure). At the centre of the jar on the bottom surface is a dot. Find the minimum diameter of a disc, such that when placed on the top surface symmetrically about the centre, the dot is invisible.
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the ______.
