The box of a pin hole camera, of length … has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength … the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say …) when :

Option A. Given geometrical spread …

Wave Optics

JEE Main 2016 · Session, Shift 1 · Q8391

PhysicsMedium84×since 2003Q8391

The box of a pin hole camera, of length

L,

has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength

\lambda

the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say

{b_{\min }}

) when :

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Wave Optics — JEE Main 2016 · Session, Shift 1 · Q8391 · Alror