dispersive power वाक्य
उदाहरण वाक्य
मोबाइल
- It is prized for its exceptional dispersive power ( 0.051, B to G interval ) which exceeds that of diamond.
- Lead-free crystal has a similar refractive index to lead crystal, but it is lighter and it has less dispersive power.
- Newton failed to perceive the existence of media of different dispersive powers required by achromatism; consequently he constructed large reflectors instead of refractors.
- Glass with weaker dispersive power ( greater v ) is named " crown glass "; that with greater dispersive power, " flint glass ".
- Glass with weaker dispersive power ( greater v ) is named " crown glass "; that with greater dispersive power, " flint glass ".
- Consequently the powers of the two must be different ( in order that f be not zero ( equation 2 ) ), and the dispersive powers must also be different ( according to 4 ).
- For the construction of an achromatic collective lens ( f positive ) it follows, by means of equation ( 4 ), that a collective lens I . of crown glass and a dispersive lens II . of flint glass must be chosen; the latter, although the weaker, corrects the other chromatically by its greater dispersive power.
- Should the cemented system be positive, then the more powerful lens must be positive; and, according to ( 4 ), to the greater power belongs the weaker dispersive power ( greater v ), that is to say, crown glass; consequently the crown glass must have the greater refractive index for astigmatic and plane images.
- In all earlier kinds of glass, however, the dispersive power increased with the refractive index; that is, v decreased as n increased; but some of the Jena glasses by E . Abbe and O . Schott were crown glasses of high refractive index, and achromatic systems from such crown glasses, with flint glasses of lower refractive index, are called the " new achromats, " and were employed by P . Rudolph in the first " anastigmats " ( photographic objectives ).
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