Consider the following statements in case of Young's double slit experiment.
(I) A slit 
is necessary, if we use an ordinary extended source of light.
(II) A slit 
is not needed, if we use an ordinary but well collimated beam of light.
(III) A slit 
is not needed, if we use a spatially coherent source of light.
Text Solution
Verified by ExpertsThe correct answer is:
D
In case of Young's double slit experiment, a slit 
is necessary, if we use an ordinary extended source of light while it is not needed, if we use a spatially coherent source of light.
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