A lens of focal length f is cut along the
diameter into two identical halves. In this
process, a layer of the lens t in thickness
is lost, then the halves are put together to
form a composite lens. In between the focal
plane and the composite lens, a narrow slit
is placed near the focal plane. The slit is
emitting monochromatic light with
wavelength 2. Behind the lens, a screen is
located at a distance L from it.Find the fringe width for the pattern obtained under given arrangement on the screen
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