1
JEE Main 2021 (Online) 24th February Morning Shift
+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 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
3
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
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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