I would like to use a pentaprism with some amount of magnification. The pentaprism will be used to reflect a real image at 90 degrees angle but I also want the reflected image to appear larger. The distance between the prism and the real image is about 70cm. The pentaprism has two reflecting...
If I shorten the distance between the object and the mirror to less than the focal length (i.e. 30cm) I see a very similar virtual image as expected. As I increase the distance the image remains upright. Also the mirror is a two way mirror so I can more easily tell that the image is formed...
I have a spherical concave mirror with focal length of 65cm, radius of curvature of 130cm. I hold the mirror close to the eye at approximate 45 degrees and I reflect an object below it as shown in the image.
The distance between the object and the mirror is 90cm, that is more than the focal...
Hi Sophie,
Thank you for the reply and for the suggestions. Your comments are good. Let me try to answer your questions. I made an updated illustration:
The observer looks at a lens and sees a reflection of the real image. The blue line represents the ray diagram from the real image...
I am a using a mirror to reflect an image at an angle of incidence of 10 degrees. The mirror is also at an angle of incidence of approximately 30 degrees from the viewer and it creates undesired reflections when looking at the mirror. Here is a diagram illustrating the situation.
I am looking...
I thought in optics there are two sources, a point source and an extended source. A point source is single point while an extended source is a collection of points. The phone being larger than a single point (a collection of pixels that emit light, each pixel being a point source itself) would...
I need to collimate an extended source (for example a cell phone) to infinity or as far as possible. I show an illustration below
The collimator lens is about 2cm from the eye and the extended source is about 60cm from the eye. My understanding is that a collimator lens with a focal length...
TIR and prisms were my first thought as well but I wanted to ask on this forum in case there is another technology that I had not thought of.
The application involves the entire visible spectrum not just the a specific wavelength.
I am looking for an optical piece that can act as a mirror when the angle of incidence is close to normal (90 degrees) but acts as a see-through glass when the angle of incidence is less than 60 degrees?
Alternatively it can be a filter placed in front of a mirror that passes a lot of light at...
I have google it and a ray diagram for an object located beyond the focal length of a concave mirror should produce an inverted image like shown below.
What happens in my case is that the image is upright. So I am guessing that the focal length listed for this mirror refers to something else?
I have a Cassini PM-160 spherical mirror used in telescopes as the primary mirror. The mirror is concave with a radius of curvature of 2600mm and focal length of 1300mm. I have a very basic question.
If an on object is located beyond the focal length of a concave mirror then the virtual image...
If the distance between the real image and the magnifying optic(s) is 30cm, then magnifying that 5times will give a virtual distance of 1.50m. In a compact setting as AR glasses the distance between the real image and the magnifying optics is probably 3cm. To get the same virtual distance the...
Yes,, but in buit-in HUDs the distance between the real image and the magnifying optics is 10 times or even more larger than in a AR glass. The location of the image is dependent on that distance.
Good article, the proposed HUD explained in the paper is not implemented in any car and it would project the image at 2.5m from the driver or about 1.5m beyond the windshield. Projecting a virtual image at infinity is probably too much and it would have the blurring effect that you describe...
Good comments from all of you.
It depends on the car, in the Mini Cooper that I tried the virtual image appeared on the static car front when looking down even after adjusting the position of the HUD. At that point I was wondering why it is even transparent.
For obvious reasons, the enemy...