CUET · PHYSICS · PYQ PAPER 2025
In a Young's double-slit experiment, the slits are separated by 0.28 mm and the wavelength of light used is 6000 A. The fringes are observed on a screen placed 1.4 m away from the slits. The distance between the central bright fringe and the fourth bright fringe will be
- A 0.3 cm
- B 0.6 cm
- C 1.2 cm
- D 2.4 cm
Answer & Solution
Correct Answer
(C) 1.2 cm
Step-by-step Solution
Detailed explanation
\( y_n = \frac{n \lambda D}{d} \) \( y_4 = \frac{4 \times 6000 \times 10^{-10} \, \text{m} \times 1.4 \, \text{m}}{0.28 \times 10^{-3} \, \text{m}} \) \( y_4 = 1.2 \times 10^{-2} \, \text{m} = 1.2 \, \text{cm} \)
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