How to rotate a projected image 90 degrees

Question

In film school, I wanted to project a film of mine in portrait (vertical) orientation rather than landscape (horizontal) orientation. However, my film professor told me that the projector couldn't be tipped on its side; oil in parts of the projector would drip over the film and onto the light, possibly making it explode.

How did I rotate the projected image 90 degrees without tipping the film projector?

HINT:

I used 2 flat mirrors.

score 7 · Accepted Answer · answered Feb 02 '17 at 01:16

7

Here is a way I think would work.

Use a mirror at about a 45 degree angle in front of the projector that redirects the light up. Then use another one that intercept that projection at a 45 degree angle and redirect it to the left. The end image will be projected on the left of the projector, not in the front like usual.

answered Feb 02 '17 at 01:16

stack reader

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Exactly! It took me months to figure that out. Nicely done! – BrettFromLA Feb 02 '17 at 05:59
@CreatedByBrett thanks. I haven't had physics class for over 10 years, but I really like it. I had to close my eyes and imagine your smiley face drawing rebound on mirrors in my mind for a while before I got the correct directions XD – stack reader Feb 02 '17 at 06:03
@CreatedByBrett Oddly, took me just several seconds to solve this, even though other riddles around here seem impossible to me. – R.I.P.30.12.21Baskakov_Dmitriy Feb 02 '17 at 21:17
@Baskakov_Dmitriy That's surprising! You must have exceptional spatial reasoning skills. – BrettFromLA Feb 02 '17 at 22:16

How to rotate a projected image 90 degrees

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