CUET · PHYSICS · PYQ PAPER 2023
Two slits are kept 1 mm apart and the screen is placed 1.0 m away. What is the fringe separation when blue-green light of wavelength 500 nm is used ?
- A 0.05 mm
- B 0.5 mm
- C 5.0 mm
- D 50.0 mm
Answer & Solution
Correct Answer
(B) 0.5 mm
Step-by-step Solution
Detailed explanation
\( \Delta y = \frac{\lambda D}{d} \) \( \Delta y = \frac{(500 \times 10^{-9} \, \text{m})(1.0 \, \text{m})}{1 \times 10^{-3} \, \text{m}} \) \( \Delta y = 0.5 \times 10^{-3} \, \text{m} = 0.5 \, \text{mm} \)
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