1
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
A thin convex lens L (refractive index = 1.5) is placed on a plane mirror M. When a pin is placed at A, such that OA = 18 cm, its real inverted image is formed at A itself, as shown in figure. When a liquid of refractive index μ1 is put between the lens and the mirror, The pin has to be moved to A', such that OA' = 27 cm, to get its inverted real image at A' itself. The value of μ1 will be :-
A
$$\sqrt 3$$
B
3 / 2
C
$$\sqrt 2$$
D
4 / 3
2
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
A convex lens of focal length 20 cm produces images of the same magnification 2 when an object is kept at two distances x1 and x2 (x1 > x2) from the lens. The ratio of x1 and x2 is :-
A
3 : 1
B
2 : 1
C
5 : 3
D
4 : 3
3
JEE Main 2019 (Online) 9th April Morning Slot
+4
-1
A concave mirror for face viewing has focal length of 0.4 m. The distance at which you hold the mirror from your face in order to see your image upright with a magnification of 5 is :
A
0.24 m
B
0.32 m
C
1.60 m
D
0.16 m
4
JEE Main 2019 (Online) 8th April Evening Slot
+4
-1
A convex lens (of focal length 20 cm) and a concave mirror, having their principal axes along the same lines, are kept 80 cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of 30 cm to the left of the convex lens, its image remains at the same position even if the concave mirror is removed. The maximum distance of the object for which this concave mirror, by itself would produce a virtual image would be :-
A
25 cm
B
10 cm
C
20 cm
D
30 cm
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