1
JEE Main 2020 (Online) 2nd September Evening Slot
+4
-1
In a Young’s double slit experiment, 16 fringes are observed in a certain segment of the screen when light of a wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment of the screen would be
A
28
B
24
C
30
D
18
2
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source ($$\lambda$$ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at a distance of 1.27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close is
A
1.27 $$\mu$$m
B
2.05 $$\mu$$m
C
2.87 nm
D
2 nm
3
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is $${1 \over 8}$$th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is :
A
0.853
B
0.568
C
0.672
D
0.760
4
JEE Main 2020 (Online) 7th January Evening Slot
+4
-1
In a Young's double slit experiment, the separation between the slits is 0.15 mm. in the experiment, a source of light of wavelengh 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is :
A
4.9 mm
B
5.9 mm
C
6.9 mm
D
3.9 mm
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