1
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1
A plane polarized light is incident on a polariser with its pass axis aking angle $$\theta$$ with x-axis, as shown in the figure. At four different values of $$\theta ,\,\theta$$ = 8o, 38o, 188o and 218o, the observed intensities are same.
What is the angle between the direction of polarization and x-axis ?
A
98o
B
128o
C
203o
D
45o
2
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1
Light of wavelength $$550$$ $$nm$$ falls normally on a slit of width $$22.0 \times {10^{ - 5}}$$ $$cm.$$ The angular position of the second minima from the central maximum will (in radians) :
A
$${\pi \over {12}}$$
B
$${\pi \over 8}$$
C
$${\pi \over 6}$$
D
$${\pi \over 4}$$
3
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 $$\mathop A\limits^ \circ$$ and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is :
A
3 mm
B
9 mm
C
4.5 mm
D
1.5 mm
4
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1
A single slit of width b is illuminated by a coherent monochromatic light of wavelength $$\lambda$$. If the second and fourthminima in the diffraction pattern at a distance 1 m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum ? (i.e. distance between first minimum on either side of the central maximum)
A
1.5 cm
B
3.0 cm
C
4.5 cm
D
6.0 cm
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