## Question

### Solution

Correct option is

A prism

A slit would give divergent; a biprism would give double; a glass slab would give a parallel wavefront. Edge is downward.

#### SIMILAR QUESTIONS

Q1

A plane wave of monochromatic light falls normally on a uniform thin film of oil which covers a glass plate. The wavelength of source can be varied continuously. Complete destructive interference is observed for λ = 5000Ã… and λ = 1000 Ã… and for no other wavelength in between. If μ of oil is 1.3 and that of glass is 1.5, the thickness of the film will be

Q2

A light ray frequency v and wavelength λ enters a liquid of refractive index . The ray travels in the liquid with

Q3

In a double-slit experiment, instead of taking slits of equal width, one slit is made twice as wide as the other. Then, in the interference pattern

Q4

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

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

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

Q7

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

Q8

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

Q9

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

Q10

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