MCQ
In a single slit diffraction pattern, if first maxima of light of wavelength $\lambda $ coincides with first minima of yellow light $(540\,nm)$ , then $\lambda $ is .........$nm$
- A$270$
- ✓$360$
- C$540$
- D$810$
✓
Answer
Correct option: B.
$360$
b
In diffraction pattern
In diffraction pattern
First minima $=\frac{\lambda D}{a}$
First maxima $=\frac{3 \lambda D}{2 a}$
$\Rightarrow \frac{3 \lambda D}{2 a}=\frac{(540) D}{a}$
$\Rightarrow \quad \lambda=360 \mathrm{\,nm}$
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