Light comes from the vacuum and reflects off a soap film floating in air. Light comes from the vacuum and reflects off a soap film floating over glass.
Light comes from the glass and reflects off a soap film with vacuum on the other side.
Light of wavelength 400 nm is incident on a single slit of width 15 microns. A spy satellite travels at a distance of 50 km above Earth's surface. Assume the light has a wavelength of 400 nm .