Download App

Wave Optics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsWave Optics3 Marks
Question
In a single slit diffraction experiment, when a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?

State two points of difference between the interference pattern obtained in Young’s double slit experiment and the diffraction pattern due to a single slit.

✓

Answer

Explanation: Waves diffracted at the edge of circular obstacle interfere constructively at the centre of the shadow producing a bright spot.
Points of Differences:
  1. In interference, All bright fringes are of equal intensity, while in diffraction intensity of secondary maxima keeps on decreasing.
  2. Width of all fringes are equal in interference pattern but, in diffraction the width of central maximum and  the secondary maxima are different.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Wave Optics→Wave Optics — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Draw a labelled diagram of an a.c. generator. Explain briefly its principle and working.
→
There are energy bands in a solid. Do we have really continuous energy variation in a band or do we have very closely spaced but still discrete energy levels?
→
Show that it is not possible for a photon to be completely absorbed by a free electron.
→
Three resistors $1\ \Omega,\ 2\ \Omega\ \text{and}\ 3\ \Omega$ are combined in series. What is the total resistance of the combination?
If the combination is connected to a battery of emf 12 V and negligible internal resistance, obtain the potential drop across each resistor.
→
A long charged cylinder of linear charged density λ is surrounded by a hollow co-axial conducting cylinder. What is the electric field in the space between the two cylinders?
→
Can we have magnetic hysteresis in paramagnetic or diamagnetic substances?
→
Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?
→
Explain emf, potential difference and internal resistance of cell and derive the relation between them. (or derive the relation between emf, potential difference and internal resistance of the cell.)
→
Find the acceleration of a particle placed on the surface of the earth at the equator due to earth's rotation. The diameter of earth = 12800km and it takes 24 hours for the earth to complete one revolution about its axis.
→
Write the principle of working of a potentiometer. Describe briefly, with the help of a circuit diagram, how a potentiometer is used to determine the internal resistance of a given cell.
→