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Consider a soap bubble with refractive index nubble = 4/3,with air present inside and outside the
bubble. What is the thinnest wall thickness t that would strongly reflect red light (635 nm)?
Nair = 1.00
! Nbubble = 4/3
Nair
= 1.00
O A. 120 nm
O B. 160 nm
O C. 240 nm
O D. 360 nm

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