What is meant by the chromatic and spherical aberration of a mirror?
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Chromatic aberration is color smearing.  It is much more likely to occur in a lens than a mirror, since the amount of refraction in the lens depends on color, which is how a prism rainbow works.\n\nSpherical aberration is blurring caused by the mirror having a spherical shape.  A parabolic mirror won't have this.
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since its a concave mirror, f = -31.6 cm\nlet object position be u and image position v\n\nmagnifivation m = - v/u = h'/h      h is abject size n h' image size\nresulting image is uprigth so h' is +ve and is 6h\n- v/u = 6 or v = -6u\nby mirror formula 1/v+1/u=1/f\n1/u = 1/f-1/v\n1/u = 1/f + 1/6u\n5/(6u) = 1/f\nu = f * 5/6\nu = 31.6 * 5/6\nu= 26.3 cm(approx)\nits kept at a distance 26.3 cm from the pole of the concave mirror.
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Reflection of flashlight in the retina.\n\nFurther details:
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Light is refracted from a single point. Since the light which gets refracted into the same colors is all the same distance from the point source, a circle is formed.\n\n-Wied
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A convex lense is made up of individual prisms arranged in such a way that the pointed axis, which is suppossed to be the top, of one is alined to the base of the other. \nWhen ligh hits the lense, refraction occurs due to the arrangement of the prisms.\nAt the principal axis, two of these prisims are facing one another tip-to-tip in which case the light does not neccessarily pass through any of the prisms itself but through the interface of the apex of the two adjoining prisms.\nThe reverse is true for concave lesnses.
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Spherical Aberration.  It made the HST myopic.  When HST was designed, it was supposed to have a resolution of 0.1 arcseconds.  It's actual resolution was 1 arcsecond.  After the corrective lens was installed, the repaired HST now has a resolution of 0.05 arcseconds which is very, very good and better than the design specification.
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This sounds like a homework question?  Maybe I shouldn't give you the whole answer, so you can learn something on your own.\n\nYou are describing a Cassegrain telescope.  You can use the mirror formula to calculate the image plane for the first optic (the concave mirror) and then use that as the object plane for the second optic (the convex mirror) to get your final focal image plane.\n\nMirror Equation:  (1/So) + (1/Si) = -2/R\n\nSo = object plane (distance from object to mirror)\nSi = image plane (distance from image to mirror)\nR  = radius of curvature of mirror\n\nThe hardest part of these calculations is to use the right sign convention and to remember that the stars (initial object plane) can be treated as at infinity.
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If there is 10 degrees between them and both strike the mirror at 5 degrees then they will both make the same angle reflecting. !0 degrees between them.\n\nIf one ray strikes the mirror at 0 degrees and reflects straight back, the other will reflect at 10 degrees, same answer.\n\nIf one ray strikes the mirror at 10 degrees then the other ray will strike at 20 degrees. Reflected angles are 10 and 20 so it's still 10 degrees between them.\n\nYou need to subtract instead of add the angles.
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Early mirrors were usually a sheet of polished metal, often silver or copper, for example the Aranmula kannadi.\n\nMost modern mirrors consist of a thin layer of aluminium deposited on a sheet of glass. They are back silvered, where the reflecting surface is viewed through the glass sheet; this makes the mirror durable, but lowers the image quality of the mirror due to extraneous reflections from the front surface of the glass. This type of mirror reflects about 80% of the incident light. The "back side" of the mirror is often painted black to completely seal the metal from corrosion.\n\nSilvering is the chemical process of coating glass with a reflective substance, originally silver, in order to create a mirror. Today, powdered aluminum or other compounds are more often used for this purpose, although the process maintains the name "silvering
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In optics and physics, a wavefront is a line of points (called a locus) having the same phase. For a wave propagating in 3 dimensions, the locus is a surface.
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the angle between the incident ray and the perpendicular to the reflecting or refracting surface at the point of incidence
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Really interesting question. \n\nThe Abbe Sine Condition is explained simply and clearly online, see the link below. \n\nBasically it is a simple mathematical formula which predicts how to make lenses form a sharp, good quality image. It simply relates the angles of two kinds of light ray and helps in lens design.\n\nThe two kinds of light rays he talks about are rays beaming in close to the center line and rays starting at the center line and beaming outwards to the outer edges of the aperture (opening) of the lens.\n\nThese two types of rays are called paraxial (because they are almost PARAllel to the AXIs) and marginal rays (because they head towards the MARGIN or edge of the lens opening). \n\nThese simple equations are still used today in Computer Graphics for tracing the paths of light rays and producing realistic effects.\n\nAbbe was a cool guy, he was one of the first managers to insist on an eight hour day for his workers.
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this tessellation is both a rotation and translation...there is no reflections here...basiccally you notice that you can shift the shape to various places on the tessellation and have it reoccur...this is called translation.  you also notice that if you change the orientatoin of the shape...for instatnce...rotate it you find several occourances found on the tessellation\n\nhowever, this shape does not reflect because it is not symmetric anywhere.\n\nhope this helps, matttlocke
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That's just a characteristic of concave mirrors.  Check this site out.  It shows you how it happens.\n\nhttp://www.physicsclassroom.com/Class/refln/U13L3a.html
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Image in a plane mirror will be at the back sidekof the mirror at a distace equal to the distance in which the object is infront of the mirror.\n\nHence the answer is 15 mm.
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Generally household mirrors are a highly reflective silver.  \n\nAnything that is highly reflective can be considered a "mirror" (like the smooth waters of a pond, or a shiny black rock).  More than color, it is smoothness that matters in making a mirror.\n\nA porous surface scatters light in many directions while a smooth surface will reflect light back in a single direction, hence the "mirror" effect.
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It has nothing to do with the two halves of the lens anyway. The way I can explain it is spherical abberation, i.e due to the difference in the foci for the edge of the lens and the middle of the lens. But that would form a blurred image and not two images.