Instead of using two separate but identical sodium lamps, which of the following occur
a) uniform illuminations is observed
b) widely separate interference
c) very bright maximum
d) very minimum

Instead of using two slits as in young.s experiment, if we use two separate but identical sodium lamps, which of the following occur a) uniform illumination is observed b) widely separate interference c) very bright maximum d) very minimum.

Instead of using two slits as in Youngs experiment, if we use two separate but identical sodium lamps, it will result into

In which of the following circuits A, B and C given in Fig. 12.4, the cell will be used up very rapidly?

Answer the following: (a) what are coherent sources of light ? Two slits in Young's double slit experiments are illuminated by two different sodium lamps emitting light of the same wavelength. Why is no interference pattern observed? (b) Obtain the condition for getting dark and bright fringes in Young's experiment. Hence write the expression for the fringe width. (c) If s is the size of the source and its distance from the plane of the two slits, what should be the criterion for the interference fringes to be seen?

In Young's double-slit experiment, monochromatic light of wavelength 630 nm illuminates the pair of slits prodcues an interference pattern in which two consecutive bright fringes are separated by 8.1 mm. Another source of monochromatic light produces the interference pattern in which the two consecutive bright fringes are separated by 7.2 mm. Find the wavelength of light for the second source. What is the effect on the interference fringes if the monochromatic source is replaced by a source of white light?

(a) If one of two identical slits producing interference in Young's experiment is covered with glass so that the light intensity passing through it is reduced to 50%, find the ratio of the maximu and minimum intensity of the fringe in the interference pattern. (b) What kind of fringes do you expect to observe if white light is used instead of monochromatic light ?

Which separation techniques you will apply for the separation of the following mixtures ? (a) Oil from water (b) Camphor from sand (c ) Sodium chloride from its solution in water