1
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
2
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
3
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
4
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
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