A large hall in a museum has a niche in one wall. On the floor plan, the niche appears as a semicircular indentation of radius 3.85 m. A tourist stands on the centerline of the niche, 3.30 m out from its deepest point, and whispers "Hello." Where is the sound concentrated after reflection from the niche? m from the deepest point in the niche

What is the critical angle for total internal reflection for glass in air? Assume that nglass= 1.50 and nair = 1.00.

After a long day of driving you take a late-night swim in a motel swimming pool. When you go to your room, you realize that you have lost your room key in the pool. You borrow a powerful flashlight and walk around the pool, shining the light into it. The light shines on the key, which is lying on the bottom of the pool, when the flashlight is held 1.2 m above the water surface and is directed at the surface a horizontal distance of 1.5 m from the edge. If the water here is 4.0 m deep, how far is the key from the edge of the pool? (Given refractive index of water is = 1.33) 1.5 m 1.2 m 4.0 m

A gemstone (n = 1.72) is submerged in oil (n = 1.45). A light ray in the gem is incident onto the surface at 45 degrees. Will the light refract into the oil? Yes No

a. A ray of light enters a fiber optic cable with index of refraction n from air at an angle e as shown below. Let the angle 0 be 69°. For total internal reflection to occur at the cable-air interface, what must be the value of n? Dair - 1 n = Ꮎ θα ec n

The index of refraction of a certain glass is (1.44x10^0). What is the critical angle for total internal reflection at the glass-air interface? Express your result in degrees with three significant figures.