lense Flashcards
(11 cards)
1
Q
optical centre c
A
point midway between lens surface on its principal axis
2
Q
focal point or principal focus
A
point on principal axis to which
an incident beam
parallel to principal axis
is made to converge
3
Q
focal length
A
dist between opticL centre and principal focus
4
Q
focal plane
A
vertical plane which passes through pf and perpendicular to pf
5
Q
u=infinity
A
inverted real diminished
image dist =f
objects lens of a telescope
6
Q
u>2f
A
inverted real diminished
f
7
Q
u=2f
A
inverted real same size as object
v=2f
photocopier
8
Q
f<u></u>
A
inverted real magnified
v>2f
projector
9
Q
u=f
A
upright virtual magnified
infinity
spotlight
10
Q
u
A
upright virtual magnified
image behind object
magnifying glass
11
Q
principal axis
A
line passing through optical centre c and perpendicular to plane of lens
