Lens terminology

Question 1

Converging lenses

Answer 1

parallel rays of light converge after refraction through lenses
thickest in middle, thin on edges
virtual is where object and incident rays are, real is where image appears

Question 2

Converging lens terminology (optical center and principal axis)

Answer 2

O- optical center (center of lens)

Principal axis- line perpendicular to center or lens

Question 3

Converging lens terminology (focus and focus prime)

Answer 3

F- focus- where any light parallel to principal axis converges after refracting through lens (where eye is)
- f is here because it is where the lights rays converge after going through the lenses and refracting
F’- focus prime- same distance as focus, but on side of where incident rays are (on opposite of where eye is)

Question 4

Diverging lens

Answer 4

parallel light rays diverge after refracting through lens
thick on edges, thin in middle
virtual is where object is and incident rays

Question 5

diverging rays (O and Principal axis)

Answer 5

they have both in same spot

Question 6

Diverging rays (F and F’)

Answer 6

Light converges on the virtual side of the lens (where object and incident rays are) so the F is on this side too. (virtual)
F’ is on the real side of the lens as it is where the light diverges

Question 7

path of light rays through a lens

Answer 7

in a lens, light is refracted at the first air to glass surface. Light then travels through the glass of the lens and is refracted again at the glass and air surface at the other side. Therefore, always two refractions in a lens