A lens made of glass (ng = 1.52) is coated with a thin film of SiO (ns = 1.45) of thickness t. Visible light is incident normally on the coated lens as in the figure below.   (a) For what minimum value of t will the reflected light of wavelength 565 nm (in air) be missing? nm (b) Are there other values of t that will minimize the reflected light at this wavelength? YesNo     Explain.

Problem 1: You want to test a special watertight monochromatic light source in an un- derwater environment. If the light source shines its beam of electromagnetic radiation into your eyes when you and the light source are above the water, with both your eyes and the light source immersed in air, the beam appears to your eyes to have a deep violet color. The index of refraction of water is about 1.33 What color, if any, would your eyes perceive the beam to have when you and the light source are submerged in water – and why? (A) No color. The beam would become invisible under water because its wavelength in water is shorter than in air, corresponding to a wavelength of ultra-violet light. The beam's wavelength in the water determines its visibility to the eye under water, and ultra-violet light is not visible to the human eye. (B) Same color as in air, above the water, i.e., deep violet. Under water, the beam would have the same wavelength as in air. The beam's wavelength in the water…

36. Figure P36.35 shows a radio-wave transmitter and a receiver separated by a distance d and both a distance h above the ground. The receiver can receive signals both directly from the transmitter and indirectly from signals that reflect from the ground. Assume the ground is level between the transmitter and receiver and a 180* phase shift occurs upon reflection. Determine the longest wavelengths that interfere (a) constructively and (b) destructively.

answer for the second two