Arocket of (variable) mass m is propelled by steadily ejecting part of its mass at velocity u (constant with respect to the rocket). neglecting gravity, the differential equation of the rocket is m(du/dm) =-u as long as u « c, c = speed of light. find v as a function of m if mmo when v-0. in the relativistic region (v/c not negligible), the rocket equation is 2 -c ) 7 solve this differential equation to find v as a function of m. show that v/c- (1 - a)/(1 +2), where (m/mo)2u/e q.3 the surface temperature of a sphere of radius 1 is held at u = sin2 θ + cos3 θ. find the interior temperature u(r, 0,d).

1.   what is light?

light is an electromagnetic wave visible to the human eye. 

2. what is a reflection?

the rebounding of a light ray when it hits a mirror.

3. what is the incident ray?

contacts the surface of an object.

4. what is the reflected ray?

bounces off a reflective surface.

5. what is the normal ray?

perpendicular to the surface of a mirror.

6. what is the angle of incidence?

an angle formed by the incident ray and the normal.

7. what is the angle of reflection?

an angle formed by the reflected ray and the normal.

8. what is refraction?

(bending.)

9. what is a converging lens?

bring together light rays that pass through.

10. what is a diverging lens?

spreads out light passing through.

11. focal point?

the real point where the refracted rays meet when the incident rays run parallel.

i copy pasted btw from an website..