1
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
A vessel of depth 2h is half filled with a liquid of refractive index $$2\sqrt 2$$ and the upper half with another liquid of refractive index $$\sqrt 2$$ . The liquids are immiscible. The apparent depth of the inner surface of the bottom of vessel will be :
A
$${h \over {\sqrt 2 }}$$
B
$${h \over {3\sqrt 2 }}$$
C
$${3 \over 4}h\sqrt 2$$
D
$${h \over {2\left( {\sqrt 2 + 1} \right)}}$$
2
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
The aperture diameter of a telescope is 5m. The separation between the moon and the earth is 4 × 105 km. With light of wavelength of 5500 $$\mathop A\limits^o$$, the minimum separation between objects on the surface of moon, so that they are just resolved, is close to :
A
20 m
B
200 m
C
600 m
D
60 m
3
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is $${1 \over 8}$$th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is :
A
0.853
B
0.568
C
0.672
D
0.760
4
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical representation of the magnitude of linear magnification (m) versus distance of the object from the mirror (x) is correctly given by :
(Graphs are drawn schematically and are not to scale)
A
B
C
D
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination