Advertisements
Advertisements
Question
The refractive indices of water and diamond are `4/3` and 2.42 respectively. Find the speed of light in water and diamond. (c = 3x108 m/s)
Advertisements
Solution
`""^amu_w = 4/3`
`""^amu_d =2.42`
`""^amu_w = 4/3 = V_a/V_w`
`:. V_w = (3 xx10^8)/(4/3) = 3 xx 10^8 xx 3/4 = 2.25 xx 10^8` m/c
`""^amu_d = 2.42 = V_a/V_d = (3xx10^8)/V_d`
`V_d = (3xx10^8)/2.42 = 1.23 xx 10^8` m/s
APPEARS IN
RELATED QUESTIONS
On the basis of Huygens' wave theory of light prove that velocity of light in a rarer medium is greater than velocity of light in a denser medium.
What is the shape of the wavefront in the following case?
Light diverging from a point source.
What is the shape of the wavefront in the following case?
Light emerging out of a convex lens when a point source is placed at its focus.
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.
State Huygen’s principle.
Using this principle draw a diagram to show how a plane wave front incident at the interface of the two media gets refracted when it propagates from a rarer to a denser medium. Hence verify Snell's law of refraction.
Use Huygens’s principle to explain the formation of diffraction pattern due to a single slit illuminated by a monochromatic source of light.
Huygens' principle of secondary wavelets may be used to
(a) find the velocity of light in vacuum
(b) explain the particle behaviour of light
(c) find the new position of a wavefront
(d) explain Snell's Law
Light waves travel in vacuum along the X-axis. Which of the following may represent the wave fronts?
Define the term wavefront. Using Huygen’s wave theory, verify the law of reflection.
Answer the following question.
Define the term wavefront. Using Huygen's wave theory, verify the law of reflection.
According to Huygen's construction, relation between old and new wavefront is ______.
Wavefront means
Figure shows a standard two slit arrangement with slits S1, S2, P1, P2 are the two minima points on either side of P (Figure). At P2 on the screen, there is a hole and behind P2 is a second 2-slit arrangement with slits S3, S4 and a second screen behind them.
Is Huygen’s principle valid for longitudinal sound waves?
Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image?
Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of maxima and minima ______.
According to Huygens’s principle, the amplitude of secondary wavelets is ______.
How is a wavefront different from a ray?
