Download App

10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
If intensity of each wave in the observed interference pattern in Young's double slit experiment is $I_0$. then for some point $P$ where the phase difference is $\phi $ , intensity $I$ will be
  • A
    $I = I_0\,\,cos\,\phi $
  • B
    $I = I_0\,\,cos^2\,\phi $
  • C
    $I = I_0\,\,(1+cos\,\phi )$
  • ✓
    $I = 2I_0\,\,(1+cos\,\phi )$
✓

Answer

Correct option: D.
$I = 2I_0\,\,(1+cos\,\phi )$
d
$\mathrm{I}=\mathrm{I}_{1}+\mathrm{I}_{2}+2 \sqrt{1_{1} \mathrm{I}_{2}} \cos \phi$

$\mathrm{I}_{\mathrm{R}}=\mathrm{I}_{0}+\mathrm{I}_{0}+2 \sqrt{I_{0} I_{0}} \cos \phi$

$\boxed{{{\text{I}}_{\text{R}}} = 2{{\text{I}}_0}(1 + \cos \phi )}$

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 "M.C.Q (1 Marks)" from 10. Wave optics→10. Wave optics — all question types→Physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

With reference to the observations in photo-electric effect, identify the correct statements from below:

$A.$ The square of maximum velocity of photoelectrons varies linearly with frequency of incident light.

$B.$ The value of saturation current increases on moving the source of light away from the metal surface.

$C.$ The maximum kinetic energy of photo-electrons decreases on decreasing the power of LED (light emitting diode) source of light.

$D.$ The immediate emission of photo-electrons out of metal surface can not be explained by particle nature of light/electromagnetic waves.

$E.$ Existence of threshold wavelength can not be explained by wave nature of light/electromagnetic waves.

Choose the correct answer from the options given below:

→
Find potential of $J$ with : respect to $G -$ ............. $V$
→
Particle like behavior of light arises from the fact that each quanta of light has definite $...X...$ and a fixed value of $...Y.. $ just like a particle, Here, $X$ and $Y$ refer to?
→
What is the phase difference between electric and magnetic fields in an electromagnetic wave?
→
If a copper rod carries a direct current, the magnetic field associated with the current will be:
→
Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment $\vec m$ . Which configuration has highest net magnetic dipole moment
→
A charge $q$ is surrounded by a closed surface consisting of an inverted cone of height $h$ and base radius $R$, and a hemisphere of radius $R$ as shown in the figure. The electric flux through the conical surface is $\frac{n q}{6 \in_0}$ (in SI units). The value of $n$ is. . . . 
→
Statement $-1$ : Ampere law can be used to find magnetic field due to finite length of a straight current carrying wire.

Statement $-2$ : The magnetic field due to finite length of a straight current carrying wire is symmetric about the wire.

→
A ray of light of frequency $5 \times 10^{14} \,Hz$ is passed through a liquid. The  wavelength of light measured inside the liquid is found to be $450 \times 10^{-9} \,m$. Calculate the refractive index of the liquid
→
At time $\mathrm{t}=0$ magnetic field of $1000$ Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to $500$ Gauss, in the next $5 \;\mathrm{s}$, then induced $EMF$ in the loop is ........$ \mu \mathrm{V}$
→