1
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
2
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
3
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
4
JEE Main 2020 (Online) 6th September Morning Slot
+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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