1
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
A light wave is incident normally on a glass slab of refractive index 1.5. If 4 % of light gets reflected and the amplitude of the electric field of the incident light is 30 V/m, then the amplitude of the electric field for the wave propagating in the glass medium will be :
A
6 V/m
B
10 V/m
C
30 V/m
D
24 V/m
2
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
A point source of light, S is placed at distance L in front of the centre of plane mirror of width d which is hanging vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror, at a distance 2L as shown below. The distance over which the man can see the image of the light source in the mirror is

A
d
B
d/2
C
3d
D
2d
3
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
What is the position and nature of image formed by lens combination shown in figure ? (f1, f2 are focal lengths)

A
$${{20} \over 3}$$ cm from point B at right, real
B
70 cm from point B at right ; real
C
40 cm from point B at right; real
D
70 cm from point B at left ; virtual
4
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
In a double-slit experiment, green light (5303$$\mathop A\limits^ \circ$$) falls on a double slit having a separation of 19.44 $$\mu$$m and awidht of 4.05 $$\mu$$m. The number of bright fringes between the first and the second diffraction minima is :
A
04
B
05
C
10
D
09
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