Light and Mirrors: Investigations and Discoveries
Light & Mirrors 4
Learning Objectives
•
To investigate angles of reflection.
A Quick Recap!
•
A mysterious friend is worried that his rival is spying on
his plans.
•
We’ve discovered how people see objects.
•
But our friend has walls and fences so we need to work
out how his rival is seeing over and around those.
•
We think mirrors may have been used but need to
investigate mirrors further to know exactly how.
Light Diagrams with mirrors
Light is
emitted
from the
light
source.
Light is reflected
by the opaque
object.
Light enters
the eye and
and the ball is
seen!
The
mirror
reflects
the light.
Does the angle of the mirror matter?
•
Line up the light beam
along the black horizontal
line on your whiteboards.
•
Place the mirror at an
angle on the black line.
•
Measure the angle that
the light hits the mirror at.
•
Measure the angle the
light leaves the mirror at.
Record your results
Our Findings
What is our rule?
Periscopes
•
How can the submarine see
what is happening on the
island while under water?
•
They use a periscope!
•
Lets have a look at how
they work…
Periscopes
•
Light is emitted by a light
source.
•
Light hits the second
mirror and is reflected at
90˚ and out of the
periscope and into the eye.
•
Light is reflected by the
objects and into the
periscope.
•
Light hits the first mirror
and is reflected at 90˚
down the periscope.
Periscopes
What angle must the
mirror be at?
What Have We Discovered?
•
The rival is using a periscope to see over or around the
walls and fences.
•
Periscopes use two mirrors at 45˚ angles.
•
Light enters the periscope, hits the first mirror, travels
down the periscope, hits the second mirror and then
leaves the periscope and enters the eye.
•
Tomorrow we shall let our mysterious friend know and
help him win the trophy!
Delve into the world of light and mirrors as we investigate angles of reflection, examine how mirrors affect the perception of objects, and explore the use of periscopes in observing underwater. Discover the rules governing the reflection of light beams and unravel the mysteries of how mirrors manipulate light to provide vision beyond barriers. Engage in hands-on experiments to understand the significance of mirror angles in reflecting light rays accurately.
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Presentation Transcript
Light & Mirrors 4 www.schoolsobservatory.org
Learning Objectives To investigate angles of reflection. www.schoolsobservatory.org
A Quick Recap! A mysterious friend is worried that his rival is spying on his plans. We ve discovered how people see objects. But our friend has walls and fences so we need to work out how his rival is seeing over and around those. We think mirrors may have been used but need to investigate mirrors further to know exactly how. www.schoolsobservatory.org
Light Diagrams with mirrors The mirror reflects the light. Light is emitted from the light source. Light enters the eye and and the ball is seen! Light is reflected by the opaque object. www.schoolsobservatory.org
Does the angle of the mirror matter? Line up the light beam along the black horizontal line on your whiteboards. Place the mirror at an angle on the black line. Measure the angle that the light hits the mirror at. Measure the angle the light leaves the mirror at. www.schoolsobservatory.org
Record your results Angle light hits mirror Angle reflected light leaves mirror Angle between the beams of light (180 both answers) www.schoolsobservatory.org
Our Findings Angle light hits mirror Angle reflected light leaves mirror Angle between the beams of light (180 both answers) 20 20 140 67 67 46 32 32 116 What is our rule? www.schoolsobservatory.org
Periscopes How can the submarine see what is happening on the island while under water? They use a periscope! Lets have a look at how they work www.schoolsobservatory.org
Periscopes Light is emitted by a light source. Light is reflected by the objects and into the periscope. Light hits the first mirror and is reflected at 90 down the periscope. Light hits the second mirror and is reflected at 90 and out of the periscope and into the eye. www.schoolsobservatory.org
Periscopes What angle must the mirror be at? www.schoolsobservatory.org
What Have We Discovered? The rival is using a periscope to see over or around the walls and fences. Periscopes use two mirrors at 45 angles. Light enters the periscope, hits the first mirror, travels down the periscope, hits the second mirror and then leaves the periscope and enters the eye. Tomorrow we shall let our mysterious friend know and help him win the trophy! www.schoolsobservatory.org
