1. At what angle will 600nm light produce a second-order maximum when falling on a grating whose slits are 1.55×10?3cm apart?
? = ____ degree
2. What is the smallest thickness of a soap film (n=1.40) that would appear black if illuminated with 470nm light? Assume there is air on both sides of the soap film.
tmin = ____ meters
3. How thick (minimum) should the air layer be between two flat glass surfaces if the glass is to appear bright when 550nm light is incident normally?
tmin = ____ meters
What if the glass is to appear dark?
tmin = ____ meters