Dot Laser

How can I tell the difference between spectrums of light?

My science fair is coming up, and I am having difficulties. I'm suppose to compare the differences between spectrums with with different light sources. Please Answer responsibly if possible.

You need a diffraction grating - just possibly you might get an obvious effect from a DVD, used as a reflection grating.

You need - an ordinary , incandescent lamp

An energy saver lamp.

A laser ( any sort will do - use red for safety )

Try LED's .... I have no idea what their spectrum is.

The ordinary lamp will give a straight ROYGBIV rainbow spectrum

The energy saver will look the same but, look carefully and you will see some bands of thicker colour . These are the emission bands of excited mercury. Old fluorescent tubes show them better.
The laser will show a series of single colour dots.... lasers only give out a single frequency so they don't have a spectrum ( a spread ) to show you.

Try LED's.

The best is a neon bulb but that might be difficult to get hold of.

And orange streetlights also produce a different spectrum from the usual.

Find Dot Laser On eBay Below:

Holographic Laser Sight Scope Reflex For Red Green Dot Reticle Picatinny Rail
Holographic Laser Sight Scope Reflex For Red Green Dot Reticle Picatinny Rail
$32.99
Red Dot Laser Sight Outside Adjust Rifle Gun Scope 2 Switch Rail Mounts Box Set
Red Dot Laser Sight Outside Adjust Rifle Gun Scope 2 Switch Rail Mounts Box Set
$21.99
Tactical Red Dot Mini Laser Laser Sight With Tail Switch Scope Pistol Optics
Tactical Red Dot Mini Laser Laser Sight With Tail Switch Scope Pistol Optics
$8.98
New TAC Vector Optics Dot Laser Sight for SubCompact Pistols 21mm Picatinny Rail
New TAC Vector Optics Dot Laser Sight for SubCompact Pistols 21mm Picatinny Rail
$35.00
Lancer Tactical Red  Green Dot Sight w Laser 17728
Lancer Tactical Red Green Dot Sight w Laser 17728
$55.00
Combo 135mm 1X30 Red Dot Rifle Scope 20mm Weaver Rail Red Laser Sight QD
Combo 135mm 1X30 Red Dot Rifle Scope 20mm Weaver Rail Red Laser Sight QD
$42.99
Red Dot Mini Compact Rail Red Laser Sight Weaver for Gun Pistol
Red Dot Mini Compact Rail Red Laser Sight Weaver for Gun Pistol
$11.46
Mini Low Profile Rail Mount Red Dot Laser Sight Weaver Picatinny Style CA10
Mini Low Profile Rail Mount Red Dot Laser Sight Weaver Picatinny Style CA10
$10.99
NEW Red Dot Sight Laser fits PISTOL Glock 17 19 20 21 22 23 30 31 32 30
NEW Red Dot Sight Laser fits PISTOL Glock 17 19 20 21 22 23 30 31 32 30
$9.39
Red Dot Sight Laser fits PISTOL Glock 17 19 20 21 22 23 30 31 32 30
Red Dot Sight Laser fits PISTOL Glock 17 19 20 21 22 23 30 31 32 30
$9.99
Bushnell Trophy TRS 25 Holographic Red Dot Sight Rifle Laser Scope 1x25mm 731303
Bushnell Trophy TRS 25 Holographic Red Dot Sight Rifle Laser Scope 1x25mm 731303
$19.87
Laser beam dot sight scope new
Laser beam dot sight scope new
$9.99
Cartridge 30 06 25 06  270 Bore Sight Scope 270 Red Dot Laser Sight Hunting
Cartridge 30 06 25 06 270 Bore Sight Scope 270 Red Dot Laser Sight Hunting
$8.98
Swiss Arms Red Dot Laser Aim Kit w Pressure Switch 20mm Mount Rail Blk 263913
Swiss Arms Red Dot Laser Aim Kit w Pressure Switch 20mm Mount Rail Blk 263913
$9.99
25 10x40 Scope Tactical Compact Red and Green Red Laser and Micro Dot Combo
25 10x40 Scope Tactical Compact Red and Green Red Laser and Micro Dot Combo
$99.99
Dual Switch Hunting Rail Mount Green Dot Laser Sight 20mm For Rifle
Dual Switch Hunting Rail Mount Green Dot Laser Sight 20mm For Rifle
$20.89
Blue Red Green Dot Laser Sight Scope Rangefinder MilDot Weaver Mount
Blue Red Green Dot Laser Sight Scope Rangefinder MilDot Weaver Mount
$15.99
2000LM R5 LED Gun Rifle flashlight Rail Mount Lamp  Red Dot Laser Sight Scope
2000LM R5 LED Gun Rifle flashlight Rail Mount Lamp Red Dot Laser Sight Scope
$12.99
Tactical Red Laser Dot Sight Scope w Tools for Gun Rifle Pistol Picatinny Mount
Tactical Red Laser Dot Sight Scope w Tools for Gun Rifle Pistol Picatinny Mount
$9.90
Outdoor Tactical Laser Dot Sight Scope w Rat tail for Gun Rifle Pistol Hunting
Outdoor Tactical Laser Dot Sight Scope w Rat tail for Gun Rifle Pistol Hunting
$9.90
Green Red Dot Laser Hunting Rifle Gun Scope Holographic Telescope Sight Scope
Green Red Dot Laser Hunting Rifle Gun Scope Holographic Telescope Sight Scope
$25.99
Tactical Laser Dot Sight Scope with Rat tail for Gun Rifle Spotting Searching
Tactical Laser Dot Sight Scope with Rat tail for Gun Rifle Spotting Searching
$9.90
NcStar VISM VDGRLB Micro Green Dot Reflex Sight Optic w Integrated Red Laser
NcStar VISM VDGRLB Micro Green Dot Reflex Sight Optic w Integrated Red Laser
$59.99
Tactical 532nm Green Dot Laser Sight For Pistol Gun W 2 mounts
Tactical 532nm Green Dot Laser Sight For Pistol Gun W 2 mounts
$13.94
3 9X40 illuminated Tactical Rifle Scope + Red Laser Dot Sight with Rail Riser
3 9X40 illuminated Tactical Rifle Scope + Red Laser Dot Sight with Rail Riser
$62.69
Tactical Holographic Laser Red Green Dot Sight Scope 20mm Picatinny Rail Mount
Tactical Holographic Laser Red Green Dot Sight Scope 20mm Picatinny Rail Mount
$19.39
Tactical Red Dot Laser CREE LED Zoomable Flashlight Sight Rifle Scope Mount Ring
Tactical Red Dot Laser CREE LED Zoomable Flashlight Sight Rifle Scope Mount Ring
$28.59
US Tactical Red Dot Laser Dual Rail Picatinny weaver switch for Gun pistol Rifle
US Tactical Red Dot Laser Dual Rail Picatinny weaver switch for Gun pistol Rifle
$3.25
Red 762x54R Cartridge Red Laser Dot Sight Boresighter
Red 762x54R Cartridge Red Laser Dot Sight Boresighter
$10.95
Tactical Holographic Aluminum Red  Green Dot Laser Sight 4 Reticles Airsoft
Tactical Holographic Aluminum Red Green Dot Laser Sight 4 Reticles Airsoft
$15.00
Tactical Holographic Reflex 4 Reticles Red Green Dot Sight Scope Laser Mount
Tactical Holographic Reflex 4 Reticles Red Green Dot Sight Scope Laser Mount
$19.49
Red Laser Dot Sight Scope for Gun Rifle Pistol With Rail 11 20MM Mount US Stock
Red Laser Dot Sight Scope for Gun Rifle Pistol With Rail 11 20MM Mount US Stock
$7.59


Recently Purchased Dot Laser:


red dot laser sight for ruger p95 9mm compact pistol gun sr9c 22 38 380 40 45, red dot laser sight 4 ruger sr22 sr22p compact 22 cal pistol gun 38 sr40 sr40c , red dot laser sight for kel tec keltec pf9 or issc m22 pistol gun 38 380 40 cal , twod gun sight laser green dot 532nm rifle scope with 20mm picatinny mount , 650nm tactical laser sight red dot dual rail picatinny mount 20mm scope bt, 650nm tactical red dot sight scope laser sight rail mount 20mm for hunting ek, redfield counterstrike red dot laser sight, gamo red laser dot sight 650nm weaver rail mount, r27 mini adjustable red dot laser sight for pistol airgun rifle ns, 50100m range 635655mm red dot laser sight, for air gun rifle pistol scope hunting red dot laser sight 1120mm rail mount us, 1x22 micro red green 5moa dot scope laser sight fit 20mm weaver rail scope mount, mini red green dot laser scope optics holographic sight reflex for rifle pistol, 1x30 illuminated red green dot rifle w green scope laser sight20mm weaver mount, hunting 1x30 red dot sights scope laser sight w level vial fits picatinny rail, under water double o ring red dot laser high intensity, red dot sight laser fit pistolglock17 19 20 21 22 23 30 31 40 45 9mm xdm xd, otw red dot sight 1x20mm 4 moa green micro rifle scope laser scopes optics, itl optronics mars infrared red dot sight reflex sight ir laser, 1x40 red dot sight w built in laserquick release weaver mount dlb140 black, 1x22x33 reflex sight red and green 4 reticle dot sight with red laser sight, nc star vism micro green dotint red lasertan vdgrlt, bsa 30mm red dot w650nm red laser tactdesign tw30rdl, tactical green dot laser sight for rifle gun scope fit 11mm21mm picatinny rail , ncstar red dot laser whand activate switch , bushnell trophy trs25 holographic red dot sight rifle laser scope 1x25mm 731303, meprolight mepro mor mamp;pb multi reddot reflex red laser ir bullseye lazer mpb, red dot laser sight rifle gun scope w rail amp; barrel mounts cap pressure switch, tactical 4x30 red green mil dot sight scope wred laser w11mm amp; 20mm rail mount, tactical holographic 4 reticle reflex red green dot laser sight fits 20mm rail, otw red dot sight 1x20mm 4 moa green micro rifle scope laser optics picatinny, mini reflex micro daulbrightness red dot laser sight fits 21mm weaver rail, 4x20 tactical hunting air rifle optics scope red dot laser sight rail mount us, tactical holographic red green dot laser sight scope for 20mm picatinny, ncstar 1x40 red dot sight wbuilt in red laser, red laser beam dot sight standard 20mm weaver picatinny mount rails for pistol, red dot optic with laser, at3 leos red dot sight w integrated laser amp; riser 2 moa scope flip up lens caps, bushnell trophy trs25 holographic red dot sight rifle laser scope 1x25mm 73, bsa pmrgsll illuminated sight w laser amp; light dot multi reticle 4 patterns, new ncstar trirail green dot reflex sight optic with red laser , ncstar red dot sight 1x40 with built in red laser quickrelease dlb140r, riflescope sight scope gunsight for shotgun rifle pistol red laser dot hunting, redgreen holographic tactical dot laser sight scope rifle mounts rail dot sight, 532nm greenred dot laser sight rifle scope 20mm picatinny rail mount, r27 mini adjustable red dot laser sight for pistol airgun rifle rm, r27 mini adjustable red dot laser sight for pistol airgun rifle rt, tactical red laser beam dot sight scope for gun rifle pistol picatinny mount, daisy electric airsoft laser point sight bb gun red dot rifle mount scope pro, tactical armed forces green dot laser scope sight module picatinny rail mounts, sporting gun tactical red dot laser sight scope w 20mm mounts hunting airsoft, adjustable red dot laser sight airsoft scope railremote switch beam for hunting, tactical laser combo optic reflex green red dot sight scope w dual illuminated r, 2510x40eg hunting rifle scope mildot dual illuminated red laser w mount, tactical holographic reflex 4 reticles redgreen dot sight scope laser mount, truglo reddot sight, barska 1x30 electro red dot sight with flashlight amp; laser ac11398