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Question

Sources 1 and 2 emit lights of different wavelengths whereas 3 and 4 emit lights of different intensities (but same wavelength). Coherence-


Your Answer
A
Can be obtained by using sources 1 and 2
Correct Answer
B
Can be obtained by using sources 3 and 4
Your Answer
C
Cannot be obtained by any of these sources
Your Answer
D
Since contrast suffers when sources 3 and 4 are used so coherence cannot be obtained by using sources 3 and 4 
 

Solution

The correct option is B Can be obtained by using sources 3 and 4
Different wavelengths would correspond to different frequencies, so coherence is not possible; whereas lights of different intensities can give coherence even if the contrast is poor.
 

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