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Please tell me what kind of prism I would need to make "spectacles" to enable me to watch TV at the end of my bed without bending my neck (which is in a plaster cast).
- Heve (age 16)
If you put a plain mirror above you at a 45o
angle you could see the TV. Unfortunately the image would be upside down. What you need is a penta-prism which has two reflecting surfaces which cancel the two inversions out.
(published on 11/04/11)
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