MHT CET · Physics · Wave Optics
A parallel beam of monochromatic light falls normally on a single narrow slit. The angular width of the central maximum in the resulting diffraction pattern
- A increases with increase of slit width.
- B decreases with increase of slit width.
- C decreases with decrease of slit width.
- D may increase or decrease with decrease of slit width.
Answer & Solution
Correct Answer
(B) decreases with increase of slit width.
Step-by-step Solution
Detailed explanation
Width of central maximum \(W_c=2\left\lfloor\frac{\lambda D}{a}\right\rfloor\)
\(\Rightarrow \mathrm{W}_{\mathrm{e}} \propto \frac{1}{\mathrm{a}}\)
\(\therefore \quad\) Angular width of principal maximum decreases with increase in width of the slit.
\(\Rightarrow \mathrm{W}_{\mathrm{e}} \propto \frac{1}{\mathrm{a}}\)
\(\therefore \quad\) Angular width of principal maximum decreases with increase in width of the slit.
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