A lens is used to image an object on to a screen. If the right half of the lens

Question

A lens is used to image an object on to a screen. If the right half of the lens is covered, a) the left half of the image disappears. b) the right half of the image disappears, c) the entire image disappears. d) the image becomes blurred. e) the image becomes fainter 11. An interference pattern is formed on a screen by shining a planar wave on a double-slit arrangement (left). If we cover one slit with a glass plate (right), the phases of the two emerging waves will be different because the wavelength is shorter in glass than in air. If the thickness of the glass is such the phase difference is 180degree, how is the original interference pattern shown at the left, altered? a) The pattern vanishes. b) The bright spots lie closer together. c) The bright spots are farther apart. d) There are no changes. c) Bright and dark spots are interchanged.

Explanation / Answer

10- e) the image becomes fainter

Reason: as any part of lens uncovered produces an image, due to covering intensity of the image decreases and it becomes fainter

11-e) Bright and dart spots are interchanged

Reason: As initially phase angle was zero,which becomes 180 in new case so both slits will produce constructive interference at places where initially destructive interference took place and vice versia.

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