thin lens sentence in Hindi
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- For a thin lens, the distances " S " 1 and " S " 2 are measured from the object and image to the position of the lens, as described above.
- By one, and likewise by several, and even by an infinite number of thin lenses in contact, no more than two axis points can be reproduced without aberration of the third order.
- Similarly to curved mirrors, thin lenses follow a simple equation that determines the location of the images given a particular focal length ( f ) and object distance ( S _ 1 ):
- They may be made of one or more conventional lenses or achromatic doublets, or a long cylindrical thin lens formula with object distance s = 2f, the image distance is calculated to s'= 2f ).
- For example, the condition for achromatism ( 4 ) for two thin lenses in contact is fulfilled in only one part of the spectrum, since dn _ 2 / dn _ 1 varies within the spectrum.
- :According to Lens ( optics ) # Compound lenses, the combined focal length of a pair of thin lenses of focal lengths f 1 and f 2 that are separated in air by a distance d is
- For the purposes of ray tracing, this is equivalent to a series of identical thin lenses of focal length " f " = " R " / 2, each separated from the next by length " d ".
- For two or more thin lenses close together, the optical power of the combined lenses is approximately equal to the sum of the optical powers of each lens : " P " = " P " 1 + " P " 2.
- In the limit of a " thin lens ", where the distances between the source, lens, and observer are much larger than the size of the lens ( this is almost always true for astronomical objects ), we can define the projected mass density
- If the distances from the object to the lens and from the lens to the image are " S " 1 and " S " 2 respectively, for a lens of negligible thickness, in air, the distances are related by the "'thin lens formula " ':
- For a thin lens in air, the focal length is the distance from the center of the concave lens ), the focal length is negative, and is the distance to the point from which a collimated beam appears to be diverging after passing through the lens.
- To be consistent with the thin lens approximation, the rays should change direction only at the center line of the lens ( and in that case the central ray can arguably be drawn as it is ) . talk ) 00 : 08, 24 April 2009 ( UTC)
- Paraxial optical systems implemented entirely with thin lenses and propagation through free space and / or graded index ( GRIN ) media, are quadratic phase systems ( QPS ); these were known before Moshinsky and Quesne ( 1974 ) called attention to their significance in connection with canonical transformations in quantum mechanics.
- This formula is exact for the second definition, if H is measured from a thin lens, or from the front principal plane of a complex lens; it is also exact for the first definition if H is measured from a point that is one focal length in front of the front principal plane.
- In most cases, two thin lenses are combined, one of which has just so strong a positive aberration ( " under-correction, " vide supra ) as the other a negative; the first must be a positive lens and the second a negative lens; the powers, however : may differ, so that the desired effect of the lens is maintained.
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