A tempered glass is placed atop a phone screen (n=1.52). Green light (540 nm) is incident from air onto the tempered glass (1.60). What is the minimum thickness of the tempered glass for the incident light to appear constructively? 0 [nm] 632 [nm] 169 [nm] 84 [nm]

White light hits the surface of a thin film (n = 1.6) perpendicularly. There is air on both sides of the membrane. The wavelengths 504 nm and 672 nm are missing from the reflected light. a) What is the minimum thickness of the thin film? b) Which wavelengths are strongly visible in the reflected light?

A Helium discharge lamp gives off two wavelengths 611 nm and 485 nm. The diffraction grating has 462 lines/mm that is observered on a screen that is 1.50 m away. What is the distance between the first order fringes of the two different wavelengths? 4.09×10-10 m 2.36 m 1.46 m 0.0965 m

Mourning doves have a small batch of iridescent feathers. The color isproduced by a 260-nm-thick layer of keratin (n = 1.56), with air on both sides that are found around the edge of the feather barbules. For what visible wavelength (or wavelengths) would this structure produce constructive interference? A) 686nm, 412nmB) 406nmC) 686nm, 541nm, 412nmD) 541nmE) 1622nm, 811nm, 270nm