JEE Mains · Physics · STD 12 - Wave optics
- JEE Mains 2025
- Medium
- MCQ
Young's double slit inteference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m , will be _______.
Pick an option to check your answer.
Answer & Solution
Correct Answer
(A) 0.23 mm
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \Delta W=\frac{\lambda D}{d \cdot \mu}=\frac{690 \times 10^{-9} \times 0.72}{1.5 \times 10^{-3} \times 1.44} \\ & \Rightarrow \Delta W=2.3 \times 10^{-4} \mathrm{~m}=0.23 \mathrm{~mm}\end{aligned}\)
More questions from Physics
- The equivalent resistance between the points \(A\) and \(B\) in the following circuit is \(\frac{x}{5} \Omega\). The value of \(x\) is ___________.
JEE Mains 2026 Hard - A circular disk of radius R meter and mass M kg is rotating around the axis perpendicular to the disk. An external torque is applied to the disk such that \(\theta(t)=5 t^2-8 t\), where \(\theta(t)\) is the angular position of the rotating disc as a function of time \(t\). How much power is delivered by the applied torque, when \(t=2 s\) ?JEE Mains 2025 Medium
- The distance of the Sun from earth is \(1.5 \times 10^{11} \,m\) and its angular diameter is \((2000) \,s\) when observed from the earth. The diameter of the Sun will be ...........JEE Mains 2022 Medium
- Which of the following statement is not true about stopping potential \(\left(\mathrm{V}_0\right)\)?JEE Mains 2024 Hard
- Two springs of force constants \(300\, N/m\) (Spring \(A\)) and \(400\, N/m\) (Spring \(B\)) are joined together in series . The combination is compressed by \(8.75\, cm\). The ratio of energy stored in \(A\) and \(B\) is \(\frac{{{E_A}}}{{{E_B}}}\). Then \(\frac{{{E_A}}}{{{E_B}}}\) is equal toJEE Mains 2013 Hard
- Magnetic flux (in weber) in a closed circuit of resistance \(20\,\Omega\) varies with time \(t(s)\) as \(\phi=8 t ^{2}-9 t +5\). The magnitude of the induced current at \(t =0.25\,s\) will be \(...mA\)JEE Mains 2022 Medium