Optics, Waves, Lasers 1

Question 1

real image

Answer 1

converge at P’

Question 2

virtual image

Answer 2

diverge at P’

Question 3

image either

Answer 3

erect or inverted

Question 4

if lateral magnification positive

Answer 4

erect

Question 5

if lateral magnification negative

Answer 5

inverted

Question 6

lateral magnification=

Answer 6

hi/ho

Question 7

focal point

Answer 7

point where parallel rays converge after reflection from concave or diverge after reflection from convex

Question 8

focal length

Answer 8

focal point to vertex

Question 9

object/image distances - plane mirror

Answer 9

1/s+1/s’=0

Question 10

object/image distances - spherical mirror

Answer 10

1/s+1/s’=2/R=1/f

Question 11

object/image distances - plane refracting surface

Answer 11

na/s+nb/s’=0

Question 12

object/image distances - spherical refracting surface

Answer 12

na/s+nb/s’=nb-na/R

Question 13

lateral magnification - plane mirror

Answer 13

m=-s’/s=1

Question 14

lateral magnification - spherical mirror

Answer 14

m=-s’/s

Question 15

lateral magnification - plane refracting surface

Answer 15

m=-nas’/nbs=1

Question 16

lateral magnification - spherical refracting surface

Answer 16

m=-nas’/nbs

Question 17

non paraxial rays

Answer 17

do not converge precisely - spherical abberation

Question 18

thin lenses - 1/s+1/s’=

Answer 18

1/f

Question 19

thin lenses 1/f=

Answer 19

(n-1)(1/R1-1/R2)

Question 20

s>0 when

Answer 20

object on incoming side (real object)

Question 21

s’>0 when

Answer 21

image is on outgoing side (real image)

Question 22

R>0 when

Answer 22

centre of curvature is on outgoing side

Question 23

m>0 when

Answer 23

image is erect

Question 24

what do cameras form?

Answer 24

real, inverted image

Question 25

camera - what controls the amount of light

Answer 25

shutter speed an aperture

Question 26

camera - intensity is inversely proportional to

Answer 26

square of f-number

Question 27

f number

Answer 27

f/D

Question 28

refraction at surface of cornea forms

Answer 28

real image on retina

Question 29

what adjusts for object distances

Answer 29

squeezing lens

Question 30

nearsighted eye

Answer 30

too long for its lens

Question 31

farsighted eye

Answer 31

too short for its lens

Question 32

power of corrective lens

Answer 32

reciprocal of focal length

in diopters

Question 33

simple magnifyer

Answer 33

creates virtual image theta’>theta at a distance of 25cm

Question 34

25cm

Answer 34

normal closest distance for comfortable viewing

Question 35

compound microscope

Answer 35

objective lens forms a first image in barrel of instrument and eyepiece forms a final virtual image of the first image

Question 36

telescope

Answer 36

same idea as microscope but object far away

Question 37

reflecting telescope

Answer 37

objective lens replaced by concave mirror

(this eliminates chromatic abberations)