A Thin Sheet of Plastic (N = 1 $\lambda$ = 700 Nm)losses

question 9

Multiple Choice

A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared ( $\lambda$ = 700 nm) losses.What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?

• A)218
• B)109
• C)55
• D)318
• E)443

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