definitions

Question 1

image formed by plane mirror

Answer 1

• virtual
• erect
• same size and shape as object
• image distance equal to object distance but opposite in sign (l’=-l)

Question 2

image formed by concave mirror

Answer 2

• may be real/virtual
• may be erected/inverted
• may be bigger/smaller
• may be nearer/further

Question 3

image formed by convex mirror

Answer 3

• virtual
• erect
• smaller than object

Question 4

depth of field

Answer 4

distance object can move without affecting sharpness of image in specific fixed position

Question 5

depth of focus

Answer 5

distance image screen can move while maintaining sharp image for fixed object position

Question 6

principal plane

Answer 6

• first principal plane (H)
  > all incident ray strike H
  > plane where primary focal length is measured from
• second principal plane (H’)
  > all emerging rays refract from H’
  > plane where secondary focal length is measured from

Question 7

back and front focal length

Answer 7

• front focal length(fll, fn)
  > distance from front surface of lens/first element of optical system to primary focal point(F) of system
• back focal length(bfl, f’v)
  > distance from back surface of lens/last element of optical system to secondary focal point(F’) of system

Question 8

focal point

Answer 8

• primary focal point(F)
  > object position that yields image at infinity
  > primary focal length(f)
• measures from primary principal plane(H) to primary focal point (F)
• secondary focal point(F’)
  > image plane when object is at infinity
  > secondary focal length(f’)
  *measured from secondary principal plane(H) to secondary focal length(f’)