Question

In Young’s double-slit experiment, the y-co-ordinates of central maxima and 10th maxima are 2 cm and 5 cm, respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5, the correspondingy-co-ordinates will be   

Solution

Correct option is

2 cm, 4 cm

Fringe width, . Therefore, λ and hence β will decrease 1.5 times when immersed in the liquid. The distance between central maxima and 10th maxima is 3 cm in vacuum. When immersed in the liquid, it will reduce to 2 cm. Position of central maxima will not change while 10th maxima will be obtained at y = 4 cm.  

SIMILAR QUESTIONS

Q1

Light of wavelength λ = 5890 Ã… falls on a double-slit arrangement having separation d = 0.2 mm. A thin lens of focal length f = 1 m is placed near the slits. The linear separation of fringes on a screen placed in the focal plane of the lens is   

Q2

In Young’s double-slit experiment, the two slits act as coherent sources of equal amplitude A and of wavelength λ. In another experiment with the same setup, the two slits are sources of equal amplitude A and wavelengthλ, but are incoherent. The ratio of intensity of light at the mid-point of the screen in the first case to that in the second case is  

Q3

In Young’s double-slit interference experiment, if the slit separation is made threefold, the fringe width becomes 

Q4

Sources 1 and 2 emit lights of different wavelengths whereas 3 and 4 emit lights of different intensities. The coherence

Q5

In Young’s double-slit experiment, the two slits act as coherent sources of equal amplitude A and of wavelength λ. In another experiment with the same setup, the two slits are sources of equal amplitude A and wavelengthλ, but are incoherent. The ratio of intensity of light at the mid-point of the screen in the first case to that in the second case is

Q6

If one of the two slits of a Young’s double-slit experiment is painted so that it transmits half the light intensity as the second slit, then  

Q7

A wave front AB passing through a system C emerges as DE. The systemC could be

                                                     

Q8

Fig. shows a wavefront P passing through two systems A and B, and emerging as Q and then as R. The systems A and B could, respectively, be

                                                       

Q9

Light waves travel in vacuum along the y-axis. Which of the following may represent the wavefront?