Unit 2 lecture 2

Question 1

when does reflection occur?

Answer 1

anytime a wave meets a new refractive index. Concurrent with refractions

Question 2

what is the angle of reflection

Answer 2

equal to the angle of incidence

Question 3

laws of reflection

Answer 3

the incident, the reflecting and the normal to the point of “impact” are all on the same plane, which is called the plane of incidence. angle of reflection equals the angle of incidence

Question 4

what is a perfect reflection on a perfect surface?

Answer 4

specular

Question 5

mirror with reflecting metal coating ontop of glass

Answer 5

will be more clear

Question 6

collimated

Answer 6

rays are parallel to each other.

Question 7

Beam vergence

Answer 7

remains collimated if originally collimated where vergence would equal 0. most critical term in geo optics

Question 8

converging beam

Answer 8

plus

Question 9

diverging beam

Answer 9

minus

Question 10

plane surface

Answer 10

does not change vergence, just changes direction

Question 11

object

Answer 11

USUALLY before the optical system. Has own light or light bouncing off of it from another source

Question 12

optical system

Answer 12

anything that modulates light

Question 13

image

Answer 13

object and optical system interact and create image

Question 14

point object

Answer 14

an object-point source that emits an infinite number of rays to all directions. we only need two rays to locate image. Does not exist in reality, just used to simplify

Question 15

extended object

Answer 15

infinite number of point objects, realistic.

Question 16

real images

Answer 16

formed on a surface by ray convergence, located at point of intersection of the rays after the optical element.

Question 17

virtual image

Answer 17

only can be viewed by an imaging system or eye, created by diverging rays. located at the point of convergence of the back-projection of the diverging rays

Question 18

three rules of virtual images from plane mirror

Answer 18

1.object is before the optics, 2.same size as virtual image, 3.distance is the same, also upright

Question 19

locating an image

Answer 19

we need two rays from the same object point. real image is located at the intersection of reflected rays, virtual image is located at the intersection of the back-projection of the reflected rays.

Question 20

optical infinity

Answer 20

rays remain parallel, no converging or diverging