- #1
LuukS
- 10
- 0
Hello,
I am working on a project in which I want to project a projection back into a slide projector using a concave mirror.
The lens of the projector has a focal point of 100mm (and an aperture of 2.8) and I want to have approximately 1 meter space between the mirror and the projector. Unfortunately I am not sure what the curvature or focal point of the mirror should be.
I tried to calculate this using the lens formula:
(From slide projector to projection, focused 2 meters away)
1/o + 1/i = 1/f
f = 100mm
i = 2000mm (to the mirror and back is 2 meters)
o = 105mm (distance between the slide and the lens)
(from the mirror back to the slide projector)
1/o + 1/i = 1/f
f = ?
i = 1000mm (image needs to be projected 1 meter back)
o = 1000mm ('object' is 1 meter behind the mirror)
That makes f = 500mm, meaning that the focal point of the mirror should be half of the distance between the mirror and the projector.
I am not sure if I am doing this correctly though... does anyone have any suggestions?
Thank you very much!
I am working on a project in which I want to project a projection back into a slide projector using a concave mirror.
The lens of the projector has a focal point of 100mm (and an aperture of 2.8) and I want to have approximately 1 meter space between the mirror and the projector. Unfortunately I am not sure what the curvature or focal point of the mirror should be.
I tried to calculate this using the lens formula:
(From slide projector to projection, focused 2 meters away)
1/o + 1/i = 1/f
f = 100mm
i = 2000mm (to the mirror and back is 2 meters)
o = 105mm (distance between the slide and the lens)
(from the mirror back to the slide projector)
1/o + 1/i = 1/f
f = ?
i = 1000mm (image needs to be projected 1 meter back)
o = 1000mm ('object' is 1 meter behind the mirror)
That makes f = 500mm, meaning that the focal point of the mirror should be half of the distance between the mirror and the projector.
I am not sure if I am doing this correctly though... does anyone have any suggestions?
Thank you very much!