A coherent portion with a width of d = 0.5mm is cut out of a convergent lens having a focal length of 20 cm. Both halves are tightly fitted against each other and a point source of monochromatic light (A = 2500 Å)is placed in front of the lens at a distance of 10 cm. Find the maximum possible number of interference bands that can be observed on the screen.

A coherent portion with a width of d = 0.5mm is cut out of a convergen

1.	A coherent portion with a width of d = 0.5mm is cut out of a convergent lens having a focal length of 20 cm. Both halves are tightly fitted against each other and a point source of monochromatic light (A = 2500 Å)is placed in front of the lens at a distance of 10 cm. Find the maximum possible number of interference bands that can be observed on the screen.
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