Originally Posted by Merlin66
if you can show me a spectrum image from a DVD/ CD with the same resolution I'll eat my pants...smart or not!!
Merlin, what end of your pants would you like to start with?
I have here the crudest DVD spectroscope imaginable : a 240mm long, 40mm diameter cardboard tube with a dvd slice/wedge(DVD split in to two halves, and one reflective side used) shoved in at 45 degrees (mee teenks?) at one end with a viewing hole above it.
At the other end is a horizontal, 0.25 mm slit made of two business cards sticky taped together .
Looking at your spectrum(reversed : as mine is a reflection not a transmissive one) I can clearly make out all the dark absorbtion lines that match the same positions on the photo you posted.
The spectra is more compressed laterally than what is seen in your photo, but the dark lines are crisp and very defined.
What's more is that this is a direct view, not a photograph.
Also, the sunlight source was not a super reflective needle.........it was just a white building facia outside my window.
I will try to take a photo of this(gonna be fun as the viewing hole was made with a pen!
Here is a description of the spectra as I see it:
Starting from the violet end, is the first black line,followed by another in the blue,......... in the green : two distinct separated lines, and what appears to be two more fainter ones as well!........a fourth in the yellow, and finally another well in to the red.
I can not see the second line at the far end of the red.
Is this because it's infrared?