Question:
A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will
A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will
Show Hint
Central maximum width is inversely proportional to slit width.
Updated On: May 3, 2026
- become broader and fainter
- become broader and brighter
- become narrower and fainter
- become narrower and brighter
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Width of central maximum $\beta = \frac{2D\lambda}{d}$, where $d$ is slit width.
Step 2: Detailed Explanation:
As $d$ increases, $\beta$ decreases (narrower). Also, the intensity increases because more light passes through the wider slit.
Step 3: Final Answer:
The central maximum becomes narrower and brighter.
Width of central maximum $\beta = \frac{2D\lambda}{d}$, where $d$ is slit width.
Step 2: Detailed Explanation:
As $d$ increases, $\beta$ decreases (narrower). Also, the intensity increases because more light passes through the wider slit.
Step 3: Final Answer:
The central maximum becomes narrower and brighter.
Was this answer helpful?
0
0
Top MET Physics Questions
- A coil of 100 turns and area $2 \times 10^{-2}m^2 $ is pivoted about a vertical diameter in a uniform magnetic field and carries a current of 5A. When the coil is held with its plane in north-south direction, it experiences a couple of 0.33 Nm. When the plane is east-west, the corresponding couple is 0.4 Nm, the value of magnetic induction is [Neglect earth's magnetic field]
- Radiation, with wavelength 6561 $?$ falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to :
- In intrinsic semiconductor at room temperature number of electrons and holes are
- A rope of mass $0.1\, kg$ is connected at the same height of two opposite walls. It is allowed to hang under its own weight. At [he contact point between the rope and the wall, the rope makes an angle $ \theta =10^{\circ} $ with respect to horizontal. The tension in the rope at its midpoint between the walls is
- At great distances from an electric dipole, the electric field strength due to the dipole varies with the distance as
View More Questions
Top MET Wave optics Questions
- In a single slit diffraction pattern, the distance between the first minimum on the left and the first minimum on the right is $5\mathrm{mm}$. The screen on which the diffraction pattern is displayed is at a distance of $80~\mathrm{cm}$ from the slit. The wavelength is $6000\mathrm{\AA}$. The slit width in (mm) is about
- When a ray is incident on a medium of refractive index $n$ at Brewster's angle, it gets
- The path difference between the two waves $y_{1} = a_{1}\sin \left(\omega t - \frac{2\pi x}{\lambda}\right)$ and $y_{2} = a_{2}\cos \left(\omega t - \frac{2\pi x}{\lambda} +\phi\right)$ is
- In Young's double slit experiment, the intensity of light coming from one of the slits is double the intensity from the other slit. The ratio of the maximum intensity to the minimum intensity in the interference fringe pattern observed is
In Young's experiment, using red light ($\lambda = 6600$ \AA), 60 fringes are seen in the field of view. How many fringes will be seen by using violet light ($\lambda = 4400$ A)?
View More Questions
Top MET Questions
- A coil of 100 turns and area $2 \times 10^{-2}m^2 $ is pivoted about a vertical diameter in a uniform magnetic field and carries a current of 5A. When the coil is held with its plane in north-south direction, it experiences a couple of 0.33 Nm. When the plane is east-west, the corresponding couple is 0.4 Nm, the value of magnetic induction is [Neglect earth's magnetic field]
- $\int\limits_{0}^{8}| x -5| d x$ is equal to
- Radiation, with wavelength 6561 $?$ falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to :
- In intrinsic semiconductor at room temperature number of electrons and holes are
- Which of the following product is formed in the reaction $ CH_3MgBr {->[(i)CO_2][(ii)H_2O]} ? $
View More Questions