Question
A single slit of a width a is illuminated by a monochromatic light of wavelength 600 ~nm . The value of ' a ' for which first minimum appears at =30^ on the screen will be :
BITSAT
Physics
Wave Optics
2023
BITSAT 2023 (Memory Based Paper 2)
BITSAT Physics Question (2023) — Solution
Options
- A. 0.6 m
- B. 1.2 m
- C. 1.8 m
- D. 3 m
Answer
B. 1.2 m
Step-by-step solution
Wavelength of monochromatic light, =600 10^ -9 ~m As fir first minima a = aligned & a 30^ =600 10^ -9 \\ & a =1200 10^ -9 ~m =1.2 m aligned
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