1
JEE Main 2021 (Online) 25th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $${{{I_{\max }} - {I_{\min }}} \over {{I_{\max }} + {I_{\min }}}}$$ will be :
A
$${{2\sqrt {2x} } \over {2x + 1}}$$
B
$${{2\sqrt {2x} } \over {x + 1}}$$
C
$${{\sqrt {2x} } \over {x + 1}}$$
D
$${{\sqrt {2x} } \over {2x + 1}}$$
2
JEE Main 2021 (Online) 24th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
If the source of light used in a Young's double slit experiment is changed from red to violet :
A
the fringes will become brighter.
B
the intensity of minima will increase.
C
consecutive fringe lines will come closer.
D
the central bright fringe will become a dark fringe.
3
JEE Main 2021 (Online) 24th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.
A
4 : 1
B
2 : 1
C
1 : 4
D
3 : 1
4
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90o. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio :

A
4 : 1 : 0
B
2 : 1 : 0
C
0 : 1 : 2
D
0 : 1 : 4
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