Light enters a solid tube made of plastic having an index of refraction of 1.60. The light travels parallel to the upper part of the tube. You want to cut the face AB so that all the light will reflect back onto the tube after it first strikes that face. (a) what is the largest that Theta can be if the tube is in air?
(b) if the tube is immersed in water of refractive index 1.33, what is the largest that Theta can be?

Asatellite that goes around the earth once every 24 hours iscalled a geosynchronous satellite. if a geosynchronoussatellite is in an equatorial orbit, its position appearsstationary with respect to a ground station, and it is known as ageostationary satellite find the radius rof the orbit of a geosynchronous satellite that circles the earth.(note that ris measured from the center of the earth, not the surface.) you mayuse the following constants: the universal gravitational constant g is 6.67 \times 10^{-11}\; {\rm n \; m^2 / kg^2}. the mass of the earth is 5.98 \times 10^{24}\; {\rm kg}. the radius of the earth is 6.38 \times 10^{6}\; {\rm m}.