1
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
Calculate the limit of resolution of a telescope objective having a diameter of 200 cm, if it has to detect light of wavelength 500 nm coming from a star :-
A
B
C
D
2
JEE Main 2019 (Online) 8th April Morning Slot
+4
-1
In an interference experiment the ratio of amplitudes of coherent waves is $${{{a_1}} \over {{a_2}}} = {1 \over 3}$$ . The ratio of maximum and minimum intensities of fringes will be :
A
2
B
4
C
18
D
9
3
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
In a double-slit experiment, green light (5303$$\mathop A\limits^ \circ$$) falls on a double slit having a separation of 19.44 $$\mu$$m and awidht of 4.05 $$\mu$$m. The number of bright fringes between the first and the second diffraction minima is :
A
04
B
05
C
10
D
09
4
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is $${1 \over 8}$$ th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to :
A
0.94
B
0.85
C
0.74
D
0.80
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