Download App

Wave Optics — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsWave Optics1 Mark
MCQ
Assertion : No interference pattern is detected when two coherent sources are infinitely close to each other.
Reason : The fringe width is inversely proportional to the distance between the two slits.
  • A
     If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • ✓
     If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • D
     If the assertion and reason both are false.
✓

Answer

Correct option: B.
 If both assertion and reason are true but reason is not the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.

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 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

A circular loop is kept in that vertical plane which contains the north-south direction. It carries a current that is towards north at the topmost point. Let A be a point on the axis of the circle to the east of it and B a point on this axis to the west of it. The magnetic field due to the loop
→
A particle of mass $9.1 \times 10^{-31}\, {kg}$ travels in a medium with a speed of $10^{6}\, {m} / {s}$ and a photon of a radiation of linear momentum $10^{-27} \,{kg}\, {m} / {s}$ travels in vacuum. The wavelength of photon is $....$ times the wavelength of the particle.
→
In the figure, current through the $3\,\Omega $ resistor is $0.8\, ampere$, then potential drop through $4\,\Omega $ resistor is ........... $V$
→
A light wave is incident normally over a slit of width $24 \times 10^{-5} \mathrm{~cm}$. The angular position of second dark fringe from the central maxima is $30^{\circ}$. What is the wavelength of light
→
In the experimental setup of meter bridge shown in the figure, the null point is obtained at a distance of $40\,cm$ from $A$. If a $10\,\Omega $ resistor is connected in series with $R_1$, the null point shifts by $10\,cm$. The resistance that should be connected in parallel with $\left( {{R_1} + 10} \right)\,\Omega $ such that the null point shifts back to its initial position is .............. $\Omega$
→
An electron enters a region where electrostatic field is 20N/C and magnetic field is 5T. If electron passes undeflected through the region, then velocity of electron will be
→
Field lines are shown close together where the
→
On an equilateral prism, it is observed that a ray strikes grazingly at one face and if refractive index of the prism is $2$ then the angle of deviation is........$^o$
→
A square loop of side $2\, a ,$ and carrying current I, is kept in $XZ$ plane with its centre at origin. A long wire carrying the same current $I$ is placed parallel to the $z-$axis and passing through the point $(0, b, 0),(b>>a)$. The magnitude of the torque on the loop about $z-$axis is given by:
→
Two charges $+3.2 \times10^{-19}C$ and$ -3.2 \times10^{-19}C$ kept 2.4 Å apart forms a dipole. If it is kept in uniform electric field of intensity $4 \times10^5\ volt/m$ then what will be its electrical energy in equilibrium
→