Answer
Given,
Periscope uses 45-45-90 prisms with total internal reflection adjacent to 45°.
refractive index of water, n_a = 1.33
refractive index of glass, n_g = 1.52
When the light enters the water, water will act as a lens and when we see the object from the periscope the object shown is farther than the usual distance.
they have more energy than radio waves.
&
because the wavelength of the light waves are too small
1. Kinetic
He makes the ball move by kicking it, which increases the kinetic energy
Good. You can do some very interesting experiments with that equipment.