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For the aperture of each instrument there are two mirrors, M 1 and M 2. M 1 which is in the light path acts as a field mirror and is a simple sphere, while the correction of the spherical aberration is done by M 2 which is not perfectly shaped and reflects the incident light unevenly. However, the deviations have been calculated so that they ...
As the mirror is not permanently fixed in place, it is possible for it to move by a small amount and cause the image to shift. This is otherwise known as "mirror flop". Some Schmidt-Cassegrain telescopes are equipped with mirror locks to fix the primary mirror in place once focus has been achieved. [6]
A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...
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The WF/PC was clear of the telescope by 04:48 UTC and moved back into its storage container. A protective hood was then removed on the new Wide Field and Planetary Camera 2 (WFPC2) (protecting its fragile external mirror) and the 280 kg (620 lb) WFPC2 was then installed at 06:05 UTC. Ground controllers then ran an Aliveness Test and 35 minutes ...
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A very complex dielectric mirror can reflect up to 99.999% of the light incident upon it, for a narrow range of wavelengths and angles. A simpler mirror may reflect 99.9% of the light, but may cover a broader range of wavelengths. Almost any dielectric material can act as a perfect mirror through total internal reflection. This effect only ...
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