Notes pb lab 07 the optics files student copys

The Optics FilesThe Optics Files
Using Mirrors and Lenses

Key Objectives:Key Objectives:
The student will investigate and
understand the interaction of
light waves

Predict the characteristics of
the images formed by lenses
and mirrors
– Illustrate and describe reflection
and refraction of visible light

Describe the behavior of light
waves
– Understand that light travels in
straight lines and is reflected,
absorbed or transmitted

– Understand that light travels
through media and undergoes a
change in speed that causes it to
bend when it does so

– Understand that when light
strikes an uneven surface or
passes through an opening it can
reflect or diffract

– Understand constructive and
destructive interference
regarding light waves

Law of Reflection
States that the angle of incidence
(direction in) is equal to the angle
of reflection (direction out)

Reflection
The bouncing back of a ray of
light, sound or heat when it hits
a surface

Plane Mirror
A mirror with a flat smooth
surface it reflects a ‘true’
reversed image
– Bathroom Mirror

Concave Mirror
A mirror that is curved inward.
(Like a bowl) It reflects an upright
larger image when inside the
focal point and an inverted
smaller image when outside the
focal point
– Compact or Make-up mirror

Convex Mirror
A mirror that bends outward from
the center. It reflects a distorted
smaller image but allows you to
see around corners.
– Bus mirrors
– Security mirrors

Diffraction
The change in direction of waves
as they bend around a
corner/edge or around an
obstacle or pass through an
opening or slit.

Refraction
The bending of light as light waves
pass through different mediums

Concave Lens
A lens that bends inward to center.
The light waves move outward as they
pass through causing an image on the
other side to appear smaller.
– Glasses

Convex Lens
A lens that bends outward from the
center.

Convex Lens
As light passes through, it focuses
the light into a fine beam and the
light and images on the other side
appear larger
– Magnifying glasses
– Reading glasses

Interference
The combination of two or more
waves that results in a single wave.

Essential Learnings
Light waves travel in straight lines
until they strike an object and then
they are either reflected, absorbed
or transmitted

Essential Learnings
Reflection is the “bouncing back” of
light waves
– There is a Law that governs
reflection stating that the Angle of
Incidence = Angle of Reflection

Essential Learnings
Refraction is the slowing and
bending of light waves as light
passes through a medium

Essential Learnings
There are three types of mirrors
that reflect light
– Plane
– Concave
– Convex

Essential Learnings
Plane Mirror - Reflects a true
sized image, upright and reversed

Essential Learnings
Concave Mirror –Makes
a larger upright image
inside the focal point, a
smaller inverted image
outside the focal point

Essential Learnings
Convex –Produce
smaller distorted but
always upright images

Essential Learnings
There are two types of lenses that
refract or bend light
– Concave
– Convex

Essential Learnings
ConcaveLens – Spreads out
(Diverge) light
Convex Lens Focus (Converge)
light

Essential Learnings
Diffraction is the bending of light
and the production of new waves
when waves strike an edge or
opening

Essential Learnings
Interference takes place when two
or more light or sound waves
overlap or combine it can be either:
– Constructive – Increases Energy
– Destructive – Decreases Energy

Essential Learnings
Constructive Interference –
Increases Energy
Destructive – Decreasese Energy

Notes pb lab 07 the optics files student copys

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