Physics
NULL
Medium
Question
Central spot of Newtons rings __________________?
A
bright
B
dark for large wavelength
C
dark
✓ Official correct answer
D
bright for large wavelength
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
bright
No member explanations yet for this option.
B
dark for large wavelength
No member explanations yet for this option.
C
dark
No member explanations yet for this option.
D
bright for large wavelength
No member explanations yet for this option.
Explanation
In Newton's rings observed by reflected light, the central spot is dark — due to destructive interference from the phase change on reflection at the glass-air interface.
So the correct answer is dark.
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