Astronomers observe the chromosphere of the Sun with a filter that passes the re

Question

Astronomers observe the chromosphere of the Sun with a filter that passes the red hydrogen spectral line of wavelength 656.3 nm, called the H? line. The filter consists of a transparent dielectric of thickness d held between two partially aluminized glass plates. The filter is held at a constant temperature. (c) The dielectric will also pass what near-visible wavelength? One of the glass plates is colored red to absorb this light. ANSWER in nm please. My answer is 656.29 nm but webassign says "Your response differs from the correct answer by more than 10%. Double check your calculations."

Explanation / Answer

2t=0/nfilm==> t=238 nm

c)
Destructive interference for reflected light happens also for lambda0
for 2t=20/nfilm or 0=nfilm 8t= (1.378)(238nm)=328 nm near UV

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