7) In place of lens, if a wedge shaped film formed by two glass plates is supplied to you, will you be able to observe Newton’s ring? Why?
Ans: Straight fringes will be formed. The glass plates may be arranged as shown. The two glass plates are inclined at a small angle (This can be achieved by simply separating them by a thin strand of wire at one end as shown). It can be shown that the reflected rays are coherent. And thus they form localized straight fringes are formed in the air film between the two glass plates.
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