At the first minimum adjacent to the central maximum of a single slit diffraction pattern, the phase difference between the Huygen’s wavelet from the edge of the slit and the wavelet from the midpoint of the slit is:
1. $$\frac{\pi}{4}\text{radian}$$
2. $$\frac{\pi}{2}\text{radian}$$
3. $${\pi}~\text{radian}$$
4. $$\frac{\pi}{8}\text{radian}$$

Subtopic:  Diffraction |
59%
From NCERT
NEET - 2015
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For a parallel beam of monochromatic light of wavelength $$\lambda$$, diffraction is produced by a single slit whose width $$a$$ is much greater than the wavelength of the light. If $$D$$ is the distance of the screen from the slit, the width of the central maxima will be:
1. $$\frac{2D\lambda}{a}$$
2. $$\frac{D\lambda}{a}$$
3. $$\frac{Da}{\lambda}$$
4. $$\frac{2Da}{\lambda}$$

Subtopic:  Diffraction |
82%
From NCERT
NEET - 2015
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A beam of light of $$\lambda = 600~\text{nm}$$ from a distant source falls on a single slit $$1~\text{mm}$$ wide and the resulting diffraction pattern is observed on a screen $$2~\text{m}$$ away. The distance between the first dark fringes on either side of the central bright fringe is:
1. $$1.2~\text{cm}$$
2. $$1.2~\text{mm}$$
3. $$2.4~\text{cm}$$
4. $$2.4~\text{mm}$$

Subtopic:  Diffraction |
63%
From NCERT
AIPMT - 2014
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A parallel beam of fast-moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?
 1 The angular width of the central maximum of the diffraction pattern will increase. 2 The angular width of the central maximum will decrease. 3 The angular width of the central maximum will be unaffected. 4 A diffraction pattern is not observed on the screen in the case of electrons.
Subtopic:  Diffraction |
51%
From NCERT
AIPMT - 2013
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A parallel beam of light of wavelength $$\lambda$$ 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 second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is:
 1 $$2 \pi$$ 2 $$3 \pi$$ 3 $$4 \pi$$ 4 $$\pi \lambda$$
Subtopic:  Diffraction |
56%
From NCERT
NEET - 2013