Shape of Reflection depends on shape of mirror
• E+40+45
The shape of the reflection of a light source from a plane mirror depends on the shape of the mirror. Thus if a square mirror is illuminated by a candle, an arc lamp, a halogen lamp (etc) then the reflection it casts will be square. In the case of an arc lamp the aperture the light is emitted from is circular making the effect more convincing to students. The most effective way to show this effect is with the sun, which is seen from Earth as being a circle. The reflection of this circle in a square mirror is seen as a square reflection. The reflection from a round mirror is seen as being round.
Related Demos
E+40+0
Arc lamp and mirror on large disk rotate showing beam angles. E+40+5
Blackboard optics: Light sources with plane and curved mirrors. E+40+10
Phantom lightbulb: Image in a plane mirror. E+40+15
Hand held plane mirror and right angle mirror. E+40+20
Variable angle mirror assembly with candle. E+40+21
Barbershop mirrors:Parallel mirrors with light bulb. E+40+25
Retrodirective reflector: Silvered right angle prism, using laser. E+40+30
Reflections from concave and convex mirrors with lighted arrow. E+40+35
Phantom bouquet: Real image from a concave mirror. E+40+40
Clam shell mirrors: Floating coin illusion. E+40+41
Concave mirrors focus candle flame on thermopile across bench. (same as 650) E+40+42
Light the Match (same as C+65+2). E+40+44
Applet: Thin Lens (converging/diverging lens/mirrors) E+40+46
Applet: Plane Mirror E+40+48
Applet: Spherical mirror: study of stigma E+40+50
Applet: The Newton telescope E+40+52
Applet: The Cassegrain telescope