JEE Main 2024 (Online) 30th January Morning Shift | Wave Optics Question 64 | Physics

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 :

2 mm

0.2 mm

0.02 mm

2 cm

JEE Main 2024 (Online) 29th January Evening Shift

MCQ (Single Correct Answer)

-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 :

$$\frac{1}{2}$$

$$\frac{3}{4}$$

$$\frac{1}{3}$$

$$\frac{1}{4}$$

JEE Main 2024 (Online) 27th January Evening Shift

MCQ (Single Correct Answer)

-1

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

$$90^\circ$$

$$30^\circ$$

$$45^\circ$$

$$60^\circ$$

JEE Main 2023 (Online) 15th April Morning Shift

MCQ (Single Correct Answer)

-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 :

${3} \mu \mathrm{m}$

$0.6 \mu \mathrm{m}$

$1.8 \mu \mathrm{m}$

$1.2 \mu \mathrm{m}$

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