Lenses and Ray Diagrams

Question 1

What are the two types of lenses

Answer 1

convex and concave

Question 2

how are concave and convex lens different

Answer 2

convex gets smaller to the top <——->
WHEREAS
concave gets wider at the top >——–<

Question 3

What do lenses allow

Answer 3

forming images by refracting light

Question 4

how do you draw ray diagrams

Answer 4

pick point on your object
draw one line perpendicular to object until it gets to the lens line
from there draw straight through primary focus point
draw another line from object this time going through the center of the the lens and draw the same point where these two lines meet

Question 5

What are the 3 comparisons we can make with images formed through lens compared to original object

Answer 5

IS object:
A. Real/virtual
B. Magnified/Diminished
C. Upright/Inverted

Question 6

How can you calculate magnification

Answer 6

image size/object size

*100

Question 7

how are images formed by convex and concave different

Answer 7

convex lens images can be virtual and real depending on how far it is from lens
whereas concave lens image are always virtual - light is spread outwards

Question 8

in a ray diagram what is the distance from the lens to the principal focus called

Answer 8

focal length