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Of the following which pair can be coherent sources

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An Intiative by Sri Chaitanya

Two sodium vapour lamps of same power connected in parallel to the same mains

Two identical filament bulbs connected in series to the same mains

Two slits in an opaque screen illuminated by a monochromatic source of light

All the above

answer is C.

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Detailed Solution

Since the light through the slits is coming from a single source hence they are coherent .

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