A fine metal foil separates one end of two pieces of opticallyflat glass. When light of wavelength 670 nm is incident normally,28 dark lines are observed (with one at each end). How thick is thefoil?
CoormaBak9
Answered question
2021-01-31
Answer & Explanation
Ayesha Gomez
Skilled2021-02-01Added 104 answers
1. For a thin film, dark bands will occur when 2 t = m ? -----------------(1) as m = 0 corresponds to the points where the plates meet,( m + 1 ) represents the number of fringes.
Hence m = 27
Substituting in equation (1) we get ? = 9.05? m
2. for this question you use thisformula
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