COMEDK · Physics · 26. Wave Optics
In Young's double slit experiment, 1st dark fringe occurs directly opposite to a slit. Wavelength of light used is
- A \(d^{2} / D\)
- B \(d / D\)
- C \(D^{2} / d\)
- D \(2 d^{2} / D\)
Answer & Solution
Correct Answer
(A) \(d^{2} / D\)
Step-by-step Solution
Detailed explanation
For dark fringe, path difference, \(\Lambda x=\left(n+\frac{1}{2}\right) \lambda\) Also, \(\quad \Delta x=\frac{d y}{D} \Rightarrow \frac{d y}{D}=\left(n+\frac{1}{2}\right) \lambda\) For 1st dark fringe at directly opposite point of slit \(n=0, y=\frac{d}{2}\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A ray of light travelling through a medium of refractive index \(\dfrac{5}{4}\) is incident on a glass of refractive index \(\dfrac{3}{2}\). Find the angle of refraction in the glass, if the angle of incidence at the given medium - glass interface is \(30^{\circ}\).COMEDK 2024 Easy
- The binding energy per nucleon for \(\mathrm{C}^{12}\) is \(7.68 \mathrm{~MeV}\) and that for \(\mathrm{C}^{13}\) is \(7.47 \mathrm{~MeV}\). The energy required to remove a neutron from \(\mathrm{C}^{13}\) isCOMEDK 2024 Medium
- A body of mass 125 kg just slides down a rough inclined plane that rises 1 m in every 2 m. What is the angle of friction?COMEDK 2025 Medium
- A network of capacitors is as shown below. If the voltage supply is 100 V , find the energy stored in the \(6 \mu \mathrm{~F}\) capacitor.
\(C_1=3 \mu F, C_2=6 \mu F, C_3=3 \mu F\) and \(C_4=4 \mu F\)COMEDK 2025 Medium - The unit of universal gravitational constant is :COMEDK 2025 Easy
- A magnetic field does not interact with:COMEDK 2023 Easy
More PYQs from COMEDK
- The nucleus of oxygen atom contains 8 protons and 8 neutrons. What is the mass defect in amu?
[Given Mass of proton \(=1.00727\) amu Mass of neutron \(=1.00866 \mathrm{amu}\) and the mass of oxygen nucleus \(=15.99053 \mathrm{amu}\).]COMEDK 2025 Medium - Which one of the following ores is concentrated by froth floatation process?COMEDK 2012 Easy
- The solution of differential equation
\(\frac{d y}{d x}-\frac{\cos ^2 y}{\sqrt{1-x^2}}=0\)COMEDK 2024 Medium - If two vertices of a triangle are \((3,-2)\) and \((-2,3)\) and its orthocentre is \((-6,1)\).
Then the difference between ordinate and abscissa of the third vertex of the triangle isCOMEDK 2025 Medium - An urn contains 9 balls, 2 of which are white, 3 blue and 4 black. 3 balls are drawn at random from the urn. The chance that 2 balls will be of the same colour and the third of a different colour isCOMEDK 2015 Easy
- If the vectors \(\mathbf{a}=2 \hat{\mathbf{i}}-3 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}, \mathbf{b}=\hat{\mathbf{i}}+2 \hat{\mathbf{j}}-\hat{\mathbf{k}}\) and \(\mathbf{c}=m \hat{\mathbf{i}}-\hat{\mathbf{j}}+2 \hat{\mathbf{k}}\) are coplanar, then the value of \(m\) isCOMEDK 2023 Medium