CONVEX LENS
OBJECT MOVES · IMAGE CHANGES
prostudypk.com
Convex Lens
F
2F
F
2F
object
image
p
=
object distance
q
=
image distance
m
=
magnification
1. Lens Formula
1/f = 1/p + 1/q
f = 15 cm · m = q / p
virtual image:
q
is negative
2. Image Nature
Beyond 2F
smaller · real · inverted
At 2F
same size · real · inverted
Between F & 2F
bigger · real · inverted
Inside F
bigger · virtual · upright
3. Remember
Object inside F → magnifying glass
Camera, eye: object beyond 2F
MATRIC PHYSICS · GEOMETRICAL OPTICS · PUNJAB BOARDS
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