1
JEE Main 2021 (Online) 24th February Evening Slot
+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.
2
JEE Main 2021 (Online) 24th February Morning Slot
+4
-1
The focal length f is related to the radius of curvature r of the spherical convex mirror by :
A
f = r
B
f = $$-$$ r
C
f = +$${{1 \over 2}}$$ r
D
f = $$-$$$${{1 \over 2}}$$ r
3
JEE Main 2021 (Online) 24th February Morning Slot
+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 Evening Slot
+4
-1
A double convex lens has power P and same radii of curvature R of both the surfaces. The radius of curvature of a surface of a plano-convex lens made of the same material with power 1.5 P is :
A
$${R \over 3}$$
B
$${{3R} \over 2}$$
C
$${R \over 2}$$
D
2R
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