What principle states that any ray of light subjected to reflection or refraction can be traced in reverse by a ray in the opposite direction?

The principle of reversibility of light.

Explanation:

The principle of reversibility of light states that the path of a ray of light is reversible. If a ray of light, after suffering a number of reflections and/or diffractions, is allowed to fall normally on a mirror, it retraces its path along reverse direction.

the following is queen elizabeth’s purposes:

- to encourage the parliament that the technique of picking successors to the seat based merely on birthright needs to be reviewed.

- (not) to convince the parliament that her kid should not be measured as a likely choice for heir to the english power.

- to persuade the parliament that merely since she has a child does not assure that the kid will be a capable leader.

- to sway the parliament how shattering it could be if they proceeded discourteously concerning her or her child.