1
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
2
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is $$\sqrt 3$$, then the angle of incidence is:
A
60o
B
45o
C
90o
D
30o
3
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is $${1 \over 8}$$ th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to :
A
0.94
B
0.85
C
0.74
D
0.80
4
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
An object is at a distance of 20 m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be :
A
1.16 $$\times$$ 10–3 m/s towards the lens
B
2.26 $$\times$$ 10–3 m/s away from the lens
C
3.22 × 10–3 m/s towards the lens
D
0.92 $$\times$$ 10$$-$$3 m/s away from the lens
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