A CD Is Made with a Plastic Coating with Index $\lambda$

question 13

Multiple Choice

A CD is made with a plastic coating with index of refraction n and is used with a laser that produces a wavelength $\lambda$ in the plastic. Which of the following pit depths would produce the desired destructive interference in this situation?

• A) "\(\lambda\)/2n"
• B) "\(\lambda\)/4"
• C) "\(\lambda\)/4n"
• D) "\(\lambda\)/2"

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