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wave interference

With the aid of a calculation, show that the colour observed would be blue for a butterfly where the distance d between ridges X and Y is 2.3 × 10⁻⁷ m.

With the aid of a calculation, show that the colour observed would be blue for a butterfly where the distance d between ridges X and Y is 2.3 × 10⁻⁷ m.

Reply 1

Joinedup

Original post by Asifanaureen

This seems like it should have been asked in the physics section https://www.thestudentroom.co.uk/forumdisplay.php?f=131

2.3 × 10−7 m is 230 nm and the wavelength of blue light is roughly 450-500 nm

In the absence of any setup or diagram I'd be wondering about the path difference between reflected light making the 2 way trip to neighbouring ridges.