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A convergent lens with a focal length of...

A convergent lens with a focal length of f = 10 cm is cut into two halves that are then moved apart to a distance of d =0.5 mm (a double lens). Find the fringe width on screen at a distance of 60 cm behind the lens if a pont source of monochromatic light `(lambda=5000Å)` is placed in front of the lens at a distance of a = 15 cm from it.

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[0.1 mm]
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