In the far field diffraction pattern of a single slit under polyc… - Vidyadip

MCQ

In the far field diffraction pattern of a single slit under polychromatic illumination, the first minimum with the wavelength ${\lambda _1}$ is found to be coincident with the third maximum at ${\lambda _2}$. So

A
$3{\lambda _1} = 0.3{\lambda _2}$
B
$3{\lambda _1} = {\lambda _2}$
✓
${\lambda _1} = 3.5{\lambda _2}$
D
$0.3{\lambda _1} = 3{\lambda _2}$

✓

Answer

Correct option: C.

${\lambda _1} = 3.5{\lambda _2}$

c
(c)Position of first minima = position of third maxima i.e., $\frac{{1 \times {\lambda _1}D}}{d} = \frac{{\left( {2 \times 3 + 1} \right)}}{2}\frac{{{\lambda _2}D}}{d}\,\, \Rightarrow \,{\lambda _1} = 3.5{\lambda _2}$

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

An electron and a photon have same wavelength of $10^{-9} \,m$. If $E$ is the energy of the photon and $p$ is the momentum of the electron, then the magnitude of $E / p$ (in $SI$ unit) is

By a surface of a liquid we mean.

An electric charge $q$ is placed at the centre of a cube of side $\alpha $. The electric flux on one of its faces will be

Which one of the series of hydrogen spectrum is in the visible region

The diode shown in the circuit is a silicon diode. The potential difference between the points A and B will be

Two waves represented by $\text{y}=\text{a}\sin(\omega\text{t}-\text{kx})$ and $\text{y}=\text{a}\cos(\omega\text{t}-\text{kx})$ are superposed. The resultant wave will have an amplitude:

At the magnetic north pole of the earth, the value of the horizontal component of earth’s magnetic field and angle of dip are respectively:

Choose the incorrect statement :

$(a)$ The electric lines of force entering into a Gaussian surface provide negative flux.

$(b)$ A charge ' $q$ ' is placed at the centre of a cube. The flux through all the faces will be the same.

$(c)$ In a uniform electric field net flux through a closed Gaussian surface containing no net charge, is zero.

$(d)$ When electric field is parallel to a Gaussian surface, it provides a finite non-zero flux.

Choose the most appropriate answer from the options given below

Find out correct option which describe the Red shift of distant galaxies.

Two infinite sheets of uniform charge density $+\sigma$ and $-\sigma $ are parallel to each other as shown in the figure. Electric field at the