A physics instructor slips a thin sheet of a transparent material with an index

Question

A physics instructor slips a thin sheet of a transparent material with an index of refraction only slightly larger than air over both of the slits in a double-slit demonstration. What will be observed with the interference pattern on the screen? (A) There will be no change. (B) The fringes will spread further apart. (C) The fringes will move closer together. (D) The fringes will shift position, but not change spacing. Two closely located, monochromatic light sources create a fixed interference pattern on a screen. The frequency of one of the sources is then decreased. What will happen to the interference pattern as a result? (A) The pattern will completely disappear. (B) The fringe spacing will increase. (C) The fringes will shift left or right, but the spacing will remain constant. (D) The fringe spacing will decrease.

Explanation / Answer

There is no effect of film.

Option a

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