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Question 1

Light ordinarily travels in a straight-line path called a

Answer 1

ray

Question 2

Light travels in the fastest time between two points, an idea called

Answer 2

Fermat’s principle of least time

Question 3

formulated by the French scientist

Answer 3

Pierre Fermat in 1650

Question 4

path of light as it strikes a medium that involves straight-line rays at various angles is referred to as:

Answer 4

geometric optics

Question 5

the angle which an incident ray makes with an imaginary line perpendicular to the surface.

Answer 5

angle of incidence, 𝜃i

Question 6

imaginary line perpendicular to the surface, referred to as the —-

Answer 6

normal.

Question 7

the angle which the reflected ray makes with the normal.

Answer 7

The angle of reflection, 𝜃r

Question 8

law of reflection states

Answer 8

that the incident and reflected rays lie in the same plane with the normal and that the angle of reflection equals the angle of incidence, 𝜃i = 𝜃r

Question 9

Diffuse reflection happens when —–. ——.

Answer 9

light is reflected in multiple directions
This happens when light hits a rough surface

Question 10

Since mirrors are microscopically smooth, light rays travel at only one path. This kind of reflection is called

Answer 10

specular reflection.

Question 11

——- is Latin for mirror

Answer 11

speculum