1
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 $$\mu$$m. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that:
A
its size increases, but intensity decreases
B
its size increases, and intensity increases
C
its size decreases, but intensity increases
D
its sizes decreases, and intensity decreases
2
JEE Main 2021 (Online) 25th February Morning Shift
+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
$${{\sqrt {2x} } \over {2x + 1}}$$
3
JEE Main 2021 (Online) 24th February Evening Shift
+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.
4
JEE Main 2021 (Online) 24th February Morning Shift
+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
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