CUET · PHYSICS · PYQ PAPER 2025
In Young's double slit experiment using monochromatic light of wavelength \(\lambda\) the intensity of light at a point on the screen is 20 units, where the path difference is \(\lambda\). The intensity of light at a point having the path difference \(\lambda / 4\) is
- A 1.5 units
- B 10 units
- C 20 units
- D 40 units
Answer & Solution
Correct Answer
(B) 10 units
Step-by-step Solution
Detailed explanation
\(I_{max} = I_1 / \cos^2\left(\frac{1}{2} \cdot \frac{2\pi}{\lambda} \cdot \lambda\right) = 20 / \cos^2(\pi) = 20 / 1 = 20\) \(I_2 = I_{max} \cos^2\left(\frac{1}{2} \cdot \frac{2\pi}{\lambda} \cdot \frac{\lambda}{4}\right) = 20 \cos^2\left(\frac{\pi}{4}\right)\)…
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