Concave mirrors focus candle flame on thermopile across bench. (same as 650)

6A20.60 • E+40+41

Concave mirrors and horn thermopile senses candle across room. (Same apparatus as X) Concave mirrors are positioned at opposite ends of the lecture table. A candle is positioned at the focal length of one mirror. A horn thermopile is positioned at the focal length of the opposite mirror. The candle flame is thus focused on the elements of the thermopile (which develops about 1 mv. per degree). The signal is amplified and projected onto a screen. Note: The multimeter produces heat and can skew results, so it should be placed outside the mirrors. Leave the amplifier on for the entire demo.

Related Demos

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6A20.30 Phantom bouquet: Real image from a concave mirror. 6A20.30 Phantom Bouquet: Real image from a concave mirror. 6A20.35 Clam shell mirrors: Floating coin illusion. 6A20.35 Clam shell mirrors: Floating coin illusion. 6A20.40 Reflections from concave and convex mirrors with lighted arrow. 6A20.60 Light the Match (same as C+65+2).

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+42 Light the Match (same as C+65+2). E+40+44 Applet: Thin Lens (converging/diverging lens/mirrors) E+40+45 Shape of Reflection depends on shape of mirror 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