Download App

10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
If we observe the single slit Fraunhofer diffraction with wavelength $\lambda$ and slit width $e$, the width of the central maxima is $2$$\theta$. On decreasing the slit width for the same $\lambda$
  • ✓
    $\theta$ increases
  • B
    $\theta$ remains unchanged
  • C
    $\theta$ decreases
  • D
    $\theta$ increases or decreases depending on the intensity of light
✓

Answer

Correct option: A.
$\theta$ increases
a
(a)$2\theta = \frac{{2\lambda }}{d}$ (where $d$ = slit width)
As $d$ decreases, $\Theta $ increases.

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

Energy per unit volume for a capacitor having area $A$ and separation $d$ kept at potential difference $V$ is given by
→
At room temperature, a $P-$ type semiconductor has
→
A  radiation of energy $'E'$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is $( C =$ Velocity of light $)$
→
A parallel plate condenser has a capacitance $50\,\mu F$ in air and $110\,\mu F$ when immersed in an oil. The dielectric constant $'k'$ of the oil is
→
A resistance $R$ and a capacitance $C$ are connected in series to a battery of negligible internal resistance through a key. The key is closed at $t = 0$. If after $t\, sec$ the voltage across the capacitance was seven times the voltage across $R$, the value of $t$ is
→
Point charge $\mathrm{q}_1=2 \mu \mathrm{C}$ and $\mathrm{q}_2=-1 \mu \mathrm{C}$ are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points
→
Consider the following statements $(A)$ and $(B)$ and identify the correct answer.

$(A)$ A zener diode is connected in reverse bias, when used as a voltage regulator.

$(B)$ The potential barrier of $\mathrm{p}-\mathrm{n}$ junction lies between $0.1\, \mathrm{~V}$ to $0.3 \,\mathrm{~V}$.

→
In $YDSE$ setup, light of wavelength $640\,nm$ is used with $d = 0.8\,mm$ and $D = 1\,m.$ If intensity at central maximum is $I_0$ and its position is $y = 0,$ then
→
When current supplied by a cell to a circuit is $0.3 \,A$, its terminal potential difference is $0.9 \,V$. When the current supplied becomes $0.25 \,A$, its terminal potential difference becomes $1.0 \,V$. The internal resistance of the cell is ............ $\Omega$
→
The ratio of the kinetic energy to the total energy of an electron in a Bohr orbit is
→