Next I got a bigger container (this acts as a prism to refract the torch light) and a bigger mirror. I started off trying the torch as it was before with a pen tip sized hole and got a rainbow which had a lot of red and yellow and not so much blue, green violet and orange. So then I took off the black card but this gave me a rainbow even further from what i wanted. Finally I cut the black card in two and left a slit about half a centimetre wide and this gave a much more even rainbow (last photo).
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