1
JEE Main 2024 (Online) 30th January Morning Shift
+4
-1

The diffraction pattern of a light of wavelength $$400 \mathrm{~nm}$$ diffracting from a slit of width $$0.2 \mathrm{~mm}$$ is focused on the focal plane of a convex lens of focal length $$100 \mathrm{~cm}$$. The width of the $$1^{\text {st }}$$ secondary maxima will be :

A
2 mm
B
0.2 mm
C
0.02 mm
D
2 cm
2
JEE Main 2024 (Online) 29th January Evening Shift
+4
-1

In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path difference between the two lights reaching at a point on the screen is $$7 \lambda / 4$$. The ratio of intensity of fringe at this point with respect to the maximum intensity of the fringe is :

A
$$\frac{1}{2}$$
B
$$\frac{3}{4}$$
C
$$\frac{1}{3}$$
D
$$\frac{1}{4}$$
3
JEE Main 2024 (Online) 27th January Evening Shift
+4
-1

When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of :

A
$$90^\circ$$
B
$$30^\circ$$
C
$$45^\circ$$
D
$$60^\circ$$
4
JEE Main 2023 (Online) 15th April Morning Shift
+4
-1
A single slit of width $a$ is illuminated by a monochromatic light of wavelength $600 \mathrm{~nm}$. The value of ' $a$ ' for which first minimum appears at $\theta=30^{\circ}$ on the screen will be :
A
${3} \mu \mathrm{m}$
B
$0.6 \mu \mathrm{m}$
C
$1.8 \mu \mathrm{m}$
D
$1.2 \mu \mathrm{m}$
EXAM MAP
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