Diffraction due to Single Slit

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LEVELJEE Main

Yellow light is used in a single slit diffraction experiment with slit width of $0.6 mm$ . If yellow light is replaced by X-rays, then the observed pattern will reveal

(A)

that the central maximum is narrower

(B)

more number of fringes

(C)

less number of fringes

(D)

no diffraction pattern

LEVELJEE Main

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the first minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is

(A)

zero

(B)

π /2

(C)

π

(D)

2 π

LEVELJEE Main

A slit of width $d$ is placed in front of a lens of focal length $0.5 m$ and is illuminated normally with light of wavelength $5.89 \times 1 0^{- 7} m$ . The first diffraction minima on either side of the central diffraction maximum are separated by $2 \times 1 0^{- 3} m$ . The width $d$ of the slit is ...... $m$ .

LEVELJEE Main

Angular width of central maximum in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 \AA. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. Calculate the wavelength of this light. The same decrease in the angular width of central maximum is obtained when the original apparatus is immersed in a liquid. Find refractive index of the liquid.

LEVELJEE Main

A narrow slit of width $1 mm$ is illuminated by monochromatic light of wavelength $600 nm$ . The distance between the first minima on either side of a screen at a distance of $2 m$ is

(A)

1.2 cm

(B)

1.2 mm

(C)

2.4 cm

(D)

2.4 mm

JEE Advanced 2026

LEVELJEE Advanced

In a single slit diffraction experiment, a slit of width $(0.016 \pm 0.002) mm$ is used to measure the wavelength of a monochromatic light source. In the diffraction pattern, the angular distance between the central maximum and first minimum is measured to be $(2^{\circ} \pm 4 0^{'})$ . The value of the fractional error in the measurement of wavelength is: [Given: $sin (2^{\circ}) = 0.035$ ]

JEE Main 2020

LEVELJEE Main

Orange light of wavelength $6000 \times 1 0^{- 10} m$ illuminates a single slit of width $0.6 \times 1 0^{- 4} m$ . The maximum possible number of diffraction minima produced on both sides of the central maximum is ......... .

JEE Main 2019

LEVELJEE Advanced

In a double-slit experiment, green light ( $5303 \overset{˚}{A}$ ) falls on a double slit having a separation of $19.44 μ -m$ and a width of $4.05 μ -m$ . The number of bright fringes between the first and the second diffraction minima is

The box of a pin hole camera, of length $L$ , has a hole of radius $a$ . It is assumed that when the hole is illuminated by a parallel beam of light of wavelength $λ$ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say $b_{min}$ ) when

(A)

a = \frac{λ L}{2}

and

b_{min} = (\frac{2 λ ^{2}}{L})

(B)

a = λ L

and

b_{min} = (\frac{2 λ ^{2}}{L})

(C)

a = λ L

and

b_{min} = 4 λ L

(D)

a = \frac{λ ^{2}}{L}

and

b_{min} = 4 λ L

JEE Main 2021

LEVELJEE Main

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter $0.1 μ m$ . If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that

(A)

its size increases and intensity increases

(B)

its size increases, but intensity decreases

(C)

its size decreases, but intensity increases

(D)

its size decreases and intensity decreases

JEE Main 2020

LEVELJEE Main

Visible light of wavelength $6000 \times 1 0^{- 8} cm$ falls normally on a single slit and produces a diffraction pattern. It is found that the second diffraction minimum is at $6 0^{\circ}$ from the central maximum. If the first minimum is produced at $θ_{1}$ , then $θ_{1}$ is close to

(A)

2 5^{\circ}

(B)

3 0^{\circ}

(C)

2 0^{\circ}

(D)

4 5^{\circ}

JEE Main 2018

LEVELJEE Advanced

The angular width of the central maximum in a single slit diffraction pattern is $6 0^{\circ}$ . The width of the slit is $1 μ m$ . The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance? (i.e. distance between the centres of each slit.)

(A)

25 μ m

(B)

50 μ m

(C)

75 μ m

(D)

100 μ m

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Yellow light is used in a single slit diffraction experiment with slit width of 0.6 mm. If yellow light is replaced by X-rays, then the observed pattern will reveal

Yellow light is used in a single slit diffraction experiment with slit width of $0.6 mm$ . If yellow light is replaced by X-rays, then the observed pattern will reveal