Of the following which pair can be coherent sources

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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

The two conditions for two light sources to be coherent are as follows: -The coherent sources of light must have originated from a single source and must be monochromatic (that is they have a single wavelength) in nature. -The path difference between the light waves from the two sources must be small.

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