1
JEE Main 2023 (Online) 29th January Morning Shift
+4
-1

In a Young's double slit experiment, two slits are illuminated with a light of wavelength $$800 \mathrm{~nm}$$. The line joining $$A_{1} P$$ is perpendicular to $$A_{1} A_{2}$$ as shown in the figure. If the first minimum is detected at $$P$$, the value of slits separation 'a' will be: The distance of screen from slits D = 5 cm

A
0.2 mm
B
0.5 mm
C
0.4 mm
D
0.1 mm
2
JEE Main 2023 (Online) 25th January Morning Shift
+4
-1 In Young's double slits experiment, the position of 5$$\mathrm{^{th}}$$ bright fringe from the central maximum is 5 cm. The distance between slits and screen is 1 m and wavelength of used monochromatic light is 600 nm. The separation between the slits is :

A
60 $$\mu$$m
B
48 $$\mu$$m
C
36 $$\mu$$m
D
12 $$\mu$$m
3
JEE Main 2023 (Online) 24th January Morning Shift
+4
-1 Given below are two statements :

Statement I : If the Brewster's angle for the light propagating from air to glass is $$\mathrm{\theta_B}$$, then the Brewster's angle for the light propagating from glass to air is $$\frac{\pi}{2}-\theta_B$$

Statement II : The Brewster's angle for the light propagating from glass to air is $${\tan ^{ - 1}}({\mu _\mathrm{g}})$$ where $$\mathrm{\mu_g}$$ is the refractive index of glass.

In the light of the above statements, choose the correct answer from the options given below :

A
Both Statement I and Statement II are false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
4
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1 An unpolarised light beam of intensity $$2 I_{0}$$ is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of $$30^{\circ}$$ relative to that of P. The intensity of the emergent light is

A
$$\frac{\mathrm{I}_{0}}{4}$$
B
$$\frac{\mathrm{I}_{0}}{2}$$
C
$$\frac{3 I_{0}}{4}$$
D
$$\frac{3 \mathrm{I}_{0}}{2}$$
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