
Concept explainers
(a)
The change you see when you gradually move the light source towards the central mirror, through a distance
(a)

Answer to Problem 1OQ
Option (a), There is no change in the pattern.
Explanation of Solution
If the mirrors are not moved, the character of the interference system remains the same. This ensures no change in the pattern of the interference.
Conclusion:
Since there is no change in the pattern, option (a) is the correct answer.
Since the dark circle change into bright circle, option (b) is incorrect.
Since the dark circle changes into bright circle and then back into dark circle, option (c) is incorrect.
Since the dark circle changes into bright circle and then back into dark circle and then into bright circle, option (d) is incorrect.
(b)
The change you see when you gradually move the movable mirror towards the central mirror, through a distance
(b)

Answer to Problem 1OQ
Option (c), The dark circle changes into a bright circle and then back into a dark circle.
Explanation of Solution
The mirrors are moved, so the character of the interference system will change. This ensures change in the pattern of the interference. The initial dark circle is due to the destructive interference pattern out of phase by
The mirror is moved by
Conclusion:
Since there is no change in the pattern, option (a) is the incorrect answer.
Since the dark circle changes into bright circle, option (b) is incorrect.
Since the dark circle changes into bright circle and then back into dark circle, option (c) is correct.
Since the dark circle changes into bright circle and then back into dark circle and then into bright circle, option (d) is incorrect.
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Chapter 37 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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