Question 347: Wave Optics

Question

In a single slit experiment, the width of the slit is doubled. Which one of the following statements is correct?

Accepted Answer

For single slit diffraction,
Fringe width $$\mathrm{W=\frac{\lambda D}{d}}$$
Also, $$\mathrm{I \propto D^2}$$
$$\mathrm{I}\propto \mathrm{D}^2$$ This means I will be 4 times the original value of $$\mathrm{I}$$. As only 1 option mentions this, the correct answer is D.

Answer

The intensity and width of the central maximum are unaffected.

Answer

The intensity remains same and angular width becomes half.

Answer

The intensity and angular width both are doubled.

Answer

The intensity increases by a factor 4 and the angular width decreases by a factor of $$\frac{1}{2}$$.

Wave Optics

In a single slit experiment, the width of the slit is doubled. Which one of the following statements is correct?

Choose the correct answer: