List of top Physics Questions on Diffraction

In a YDSE setup, the slits are separated by 1.5 mm and the distance between the slits and the screen is 2 m. On using light of wavelength 400 nm, it is observed that 20 maxima of double slit experiment lie inside the central maxima of single slit diffraction. The width of each slit is μm.
Light of wavelength 750 nm is incident normally on a slit of width 1.5 mm. Diffraction pattern is obtained on a screen 1.0 m away from the slit. Find the distance of the nearest point from the central maxima at which the intensity is zero.
“You cannot see a person standing on the other side of a boundary wall but can hear him.” Explain with reason.
A microwave of wavelength 2.0 cm falls normally on a slit of width 4.0 cm. The angular spread of the central maxima of the diffraction pattern obtained on a screen 1.5 m away from the slit, will be:
A slit of width \(e\) is illuminated by light of wavelength \(\lambda\). What should be the value of \(e\) to obtain the first maximum at an angle of diffraction \(\frac{\pi}{3}\)?
A parallel beam of light of wavelength 500 nm is incident normally on a slit of width d. If the distance between slit and screen is 0.6 m and distance of second order minimum from the centre of the screen is 6.0 mm, What is the width of the slit?
A sphere of gold when brought towards a powerful magnet experiences
Light of wavelength 680 nm is incident normally on a diffraction grating having 4000 lines/cm. The diffraction angle (in degrees) corresponding to the third-order maximum is ........
In the X-ray diffraction pattern recorded for a simple cubic solid (lattice parameter \( a = 1 \) Å) using X rays of wavelength 1 Å, the first order diffraction peak(s) would appear for the
The maximum number of intensity minima that can be observed in the Fraunhofer diffraction pattern of a single slit (width 10 µm) illuminated by a laser beam (wavelength 0.630 µm) will be
In the diffraction pattern due to a single slit, the width of the central maximum will be:
In a plane transmission grating, the angle of diffraction for the second-order principal maxima for wavelength \( 5000 \) Å is \( 30^\circ \). The number of lines per cm of the grating surface is:
If \( N \) is the total number of rulings on the grating, \( n \) is the order of the spectrum, and \( \lambda \) is the wavelength of light, then the resolving power of the grating is:
The minimum number of lines in a plane diffraction grating required to just resolve the sodium doublet (5890 Å and 5896 Å) in first order is:
How many orders will be visible if the wavelength of the incident radiation is 5000 and the number of lines on the grating is 2620 in one inch?
A nicol prism is based on the principle of ______

Monochromatic light of green color is used in Young’s double slit experiment and an interference pattern is observed on a screen. If the green light is replaced by red monochromatic light of the same intensity, how will the fringe width of the interference pattern be affected? Justify your answer.