1
JEE Main 2020 (Online) 6th September Morning Slot
+4
-1
A point like object is placed at a distance of 1 m in front of a convex lens of focal length 0.5 m. A plane mirror is placed at a distance of 2 m behind the lens. The position and nature of the final image formed by the system is :
A
2.6 m from the mirror, real
B
1 m from the mirror, real
C
2.6 m from the mirror, virtual
D
1 m from the mirror, virtual
2
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
3
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
For a concave lens of focal length f, the relation between object and image distances u and v, respectively, from its pole can best be represented by (u = v is the reference line) :
A
B
C
D
4
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
A beam of plane polarised light of large
cross-sectional area and uniform intensity
of 3.3 Wm-2 falls normally on a
polariser (cross sectional area 3 $$\times$$ 10-4 m2) which
rotates about its axis with an angular speed
of 31.4 rad/s. The energy of light passing through
the polariser per revolution, is close to :
A
1.0 $$\times$$ 10-5 J
B
1.0 $$\times$$ 10-4 J
C
1.5 $$\times$$ 10-4 J
D
5.0 $$\times$$ 10-4 J
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