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NEET UG 2013 — Physics Optics
A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, then which of the following statements is correct?
Held on 30 Apr 2013 · Verified 9 Jul 2026.
Diffraction pattern is not observed on the screen in the case of electrons
The angular width of the central maximum of the diffraction pattern will increase
The angular width of the central maximum will decrease
The angular width of the central maximum will be unaffected
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