Question
Physics Question on single slit diffraction
A slit of width ‘a’ is illuminated by red light of wavelength 6500 A°. If the first diffraction minimum falls at 30°, then the value of ‘a’ is ________
A
6.5 × 10-4 mm
B
1.3 micron
C
3250 A°
D
2.6 × 10-4 cm
Answer
1.3 micron
Explanation
Solution
The correct answer is (B) : 1.3 micron.