Advertisements
Advertisements
प्रश्न
Write the necessary conditions to obtain sustained interference fringes.
Advertisements
उत्तर
The necessary conditions to obtain sustained interference fringes are:
(i) The two sources of light must be coherent. In other words, they should emit continuous light waves of same wavelength or frequency, having either the same phase or a constant phase difference.
(ii) The two sources must be very narrow as a broad source is equivalent to a large number of narrow sources lying side by side, which causes general illumination rather than interference pattern.
(iii) The two sources should preferably be monochromatic.
(iv) The coherent sources must be very close to each other.
APPEARS IN
संबंधित प्रश्न
How does the angular separation between fringes in single-slit diffraction experiment change when the distance of separation between the slit screens is doubled?
Describe geometry of the Young’s double slit experiment with the help of a ray diagram. What is fringe width? Obtain an expression of it. Write the conditions for constructive as well as destructive interference.
Two independent monochromatic sources cannot act as coherent sources, why?
In Young's double-slit experiment, if the width of the 2nd bright fringe is 4 x 10-2 cm, then the width of the 4th bright fringe will be ______ cm.
A thin transparent sheet is placed in front of a slit in Young's double slit experiment. The fringe width will ____________.
In a biprism experiment, red light of wavelength 6500 Å was used. It was then replaced by green light of wavelength 5200 Å. The value of n for which (n + 1)th green bright band would coincide with nth red bright band for the same setting is ______.
Light waves from two coherent sources arrive at two points on a screen with a path difference of zero and λ/2. The ratio of the intensities at the points is ______
In Young's double-slit experiment, the distance between the slits is 3 mm and the slits are 2 m away from the screen. Two interference patterns can be obtained on the screen due to light of wavelength 480 nm and 600 run respectively. The separation on the screen between the 5th order bright fringes on the two interference patterns is ______
The interference pattern is obtained with two coherent light sources of intensity ratio 4 : 1. And the ratio `("I"_"max" - "I"_"min")/("I"_"max" + "I"_"min")` is `5/x`. Then the value of x will be equal to ______.
The path difference between two interference light waves meeting at a point on the screen is `(87/2)lambda`. The band obtained at that point is ______.
