Download App

Wave Optics — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsWave Optics2 Marks
Question
In a double slit interference experiment, the separation between the slits is $1.0mm$, the wavelength of light used is $5.0 \times 10^{-7}m$ and the distance of the screen from the slits is $1.0m.$
  1. Find the distance of the centre of the first minimum from the centre of the central maximum.
  2. How many bright fringes are formed in one centimeter width on the screen?
✓

Answer

Given that, $d = 1mm = 10^{-3}m, D = 1m.$
So, fringe with $=\frac{\text{D}\lambda}{\text{d}}=0.5\text{mm}.$
  1. So, distance of centre of first minimum from centre of central maximum $=\frac{0.5}{2}\text{mm}=0.25\text{mm}$
  2. No. of fringes $\frac{10}{0.5}=20.$

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 "2 Marks Questions" from Wave Optics→Wave Optics — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

If the short series limit of the Balmer series for hydrogen is $3646 \stackrel{o}{A}$ calculate the atomic number of the element which gives $X-$ ray wavelengths down to $1.0 \stackrel{o}{A}$. Identify the element.
→
Define the distance of closest approach. An α-particle of kinetic energy 'K' is bombarded on a thin gold foil. The distance of the closest approach is 'r'. What will be the distance of closest approach for an α-particle of double the kinetic energy?
→
Mention the disadvantages of phasor method of analysing AC circuits.
→
Find the area bounded by the curve $y = e^{-x},$ the $X-$ axis and the $Y-$ axis.
→
Light is incident from glass $(\mu=1.5)$ to air. Sketch the variation of the angle of deviation $\delta$ with the angle of incident i for 0 < i < 90°.
→
A convex lens of refractive index 1.5 has a focal length of 18cm in air. Calculate the change in its focal length when it is immersed in water of refractive index $\frac{4}{3}$
→
The north pole of a magnet is brought down along the axis of a horizontal circular coil. As a result, the flux through the coil changes from 0.35 weber to 0.86 weber in an interval of half a second. Find the average emf induced during this period. Is the induced current clockwise or anticlockwise as you look into the coil from the side of the magnet?
→
Can the potential function have a maximum or minimum in free space?
→
Length of a metallic wire is 1 m and its area of cross-section is A square meters. If this wire is stretched to double its length, then by how much percent will its resistance increase?
→
Monochromatic light of frequency $6.0 \times 10^{14} Hz$ is produced by a laser. The power emitted is $2.0 \times 10^{-3} W$. (a) What is the energy of a photon in the light beam? (b) How many photons per second, on an average, are emitted by the source?
→