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A concave mirror diagram showing the focus, focal length, centre of curvature, principal axis, etc. A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light.
English: A concave mirror diagram showing the focus, focal Length, centre of curvature, principal axis, etc. සිංහල: අවතල දර්පණයක ඉහත රූපයේ නාභිය , නාභි දුර , වක්රතා කේන්ද්රය , ප්රධාන අක්ෂය වැනි දෑ ...
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A concave mirror A convex mirror A convex mirror - SVG version. Reasons of nomination: According to the standards page, the images are: Of High Quality; Have a free license; Add value to an article; Accurate; With good captions; According to the same standards, the images might be: Wikipedia's best work; pleasing to the eye
Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point, and this real image is inverted. As the object approaches the focal point the image approaches infinity, and when the object passes the focal point the image becomes virtual and is not ...
A convex secondary mirror is placed just to the side of the light entering the telescope, and positioned afocally so as to send parallel light on to the tertiary. The concave tertiary mirror is positioned exactly twice as far to the side of the entering beam as was the convex secondary, and its own radius of curvature distant from the secondary.
Diagram of illumination with Lieberkühn reflector. Light comes from below (vertical lines) and is reflected (dashed lines) on the concave surface of the mirror (black circular bars) to fall on the object (circle). The objective (not depicted) is located within the gap of the concave reflector. From [6].
Mangin mirrors were used in searchlights, where they produced a nearly true parallel beam. Many Catadioptric telescopes use negative lenses with a reflective coating on the backside that are referred to as “Mangin mirrors”, although they are not single-element objectives like the original Mangin, and some even predate Mangin's invention.