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# Inteference NAT Level - 1

## 10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Inteference NAT Level - 1

Description
This mock test of Inteference NAT Level - 1 for Physics helps you for every Physics entrance exam. This contains 10 Multiple Choice Questions for Physics Inteference NAT Level - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Inteference NAT Level - 1 quiz give you a good mix of easy questions and tough questions. Physics students definitely take this Inteference NAT Level - 1 exercise for a better result in the exam. You can find other Inteference NAT Level - 1 extra questions, long questions & short questions for Physics on EduRev as well by searching above.
*Answer can only contain numeric values
QUESTION: 1

### Two slits separated by a distance of 1 mm, are illuminated with red light of wavelength 6.5 x 10-7 m. The interference fringes are observed on a screen placed 1 m from the slits. Find the distance (in mm) between the third dark fringe and the fifth bright fringe on the same side of the central maxima.

Solution: Hence we can use So distance between 5th bright fringe and 3rd dark fringe = 1.625 mm

*Answer can only contain numeric values
QUESTION: 2

### The path difference between two interfering waves at a point on the screen is λ/6. The ratio of intensity at this point and that at the central bright fringe will be : (Assume that intensity due to each slit in same)

Solution:

At path difference phase difference is   So the required ratio is *Answer can only contain numeric values
QUESTION: 3

### If the distance between the first maxima and fifth minima of a double slit pattern is 7 mm and the slits are separated by 0.15 mm with the screen 50 cm from the slits, then wavelength (in nm) of the light used is :

Solution:

There are three and a half fringes from first maxima to fifth minima as shown *Answer can only contain numeric values
QUESTION: 4

Calculate the width (in mm) of central maxima. If light of 9000 A incidents upon a slit of width 1.5 mm. Screen is kept 150 cm away from the slit.

Solution:

Width of central maxima *Answer can only contain numeric values
QUESTION: 5

If the ratio of the intensity of two coherent sources is 4, then the visibility of the fringes is.

Solution: *Answer can only contain numeric values
QUESTION: 6

If the relative permitivity and relative permeability of a medium are 2 & 1.28 respectively, then refractive index of the material is.

Solution:

Refractive Index *Answer can only contain numeric values
QUESTION: 7

Two lightwaves are given by and The ratio intensity of first wave to that of second wave is.

Solution: *Answer can only contain numeric values
QUESTION: 8

A light ray incidents on water surface from air and reflected part of it is found to be polarized. Find the deviation (in degrees) of refracted light from its original path :

Solution:    *Answer can only contain numeric values
QUESTION: 9

In young’s double slit experiment, we get 60 fringes in the field of view of monochromatic light of wavelength 4000 . If we use monochromatic light of wavelength 6000 , then the number of fringes that would be obtained in the same field of view is.

Solution:

λ α (Fringe width)
Higher 'λ' means wider fringes.
At higher wavelength, same space on the screen is occupied by wider fringes, and hence lesser number of fringes.
Also  *Answer can only contain numeric values
QUESTION: 10

A single slits of width 0.1 mm is illuminated by parallel light of wavelength 6000 and diffraction bands are observed on a screen 40 cm from the slit. The distance (in mm) of third dark band from the central bright band is :

Solution: 