Transcript Physical Attributes and Uses of Lens

S4P1 Students will investigate the
nature of light using tools such as
mirrors, lenses, and prisms.
c. Identify the physical attributes of a
convex lens, a concave lens, and a
prism and where each is used.
1. A lens that is thicker at the edges than in
the middle
2. Skinny middle
3. Think Concave caves in!
4. Objects appear smaller
5. Light bends toward the thick part
 Concave
mirrors are used as reflectors in
torches, headlights of cars, scooters etc.
 Concave mirrors are used by dentists to
see enlarged images of teeth.
 Concave mirrors are used by doctors for
examining eyes, ears, nose and throat.
1. A lens that is thicker in the middle
2. Light bends toward the thick part
(middle)
3. Makes objects look larger
 Convex
mirrors are used as side
mirrors in cars, scooters etc.
 Convex mirror has a wider view to help
drivers to see the traffic behind them.
 An
object that causes light waves to
change direction.
 Design
an investigation to determine
what happens to light as it passes
through a convex lens. Describe the
results.
A convex lens causes light to converge, or focus, producing
an image that is smaller than the original object.
 Design
an investigation to determine what
happens to light as it passes through a
concave lens. Describe the results.
A concave lens causes light to diverge, or spread out,
producing a larger image than the original.
 Identify
some common optical tools, and
describe whether each has lenses,
mirrors, and/or prisms in it. These
should include:
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eyeglasses
flashlights
cameras
binoculars
microscopes
No correction needed
a. Normal eye
b. Myopia (nearsightedness)
c. Hyperopia (farsightedness)
Corrected with concave lens
Corrected with convex lens
 Analyze
the effects of a prism on white
light and describe why this occurs.
Explain why a rainbow occurs.