2. When light travels from one medium to another of different densities thereby causing the speed of light to be slowed down;
a. What is this phenomenon called?
b. Draw a well labelled diagram showing refraction between air and water.
c. The real depth of a coin in a swimming pool is12 m. If the refractive index of water is 4/3, calculate the apparent
depth of the swimming pool.
d. The speed of light in air is 300000000 m/s. If the refractive index of diamond is 2.4, calculate the speed of light in
diamond.
Pls answer fast

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.