A slit of width a is illuminated by white light. The first minimum for red light (λ = 6500 Å) will fall at θ = 30° when a will be
A
3200 Å
B
6.5 × 10⁻⁴ mm
C
1.3 micron
D
2.6 × 10⁻⁴ cm

Question

A slit of width a is illuminated by white light. The first minimum for red light (λ = 6500 Å) will fall at θ = 30° when a will be

Accepted Answer

1.3 micron

Answer

3200 Å

Answer

6.5 × 10⁻⁴ mm

Answer

2.6 × 10⁻⁴ cm

STANDARD Physics Diffraction MCQ Question