Chromatic Aberrations
Trending Questions
Q. The dispersive powers of the materials of two lenses forming an achromatic combination are in the ratio of 4:3. Effective focal length of the lenses is +60 cm, then the focal lengths of the lenses should be
- −2 cm, 25 cm
- 20 cm, −25 cm
- −15 cm, 20 cm
- 15 cm, −20 cm
Q. If fV and fR are the focal lengths of a convex lens for violet and red light respectively and FV and FR are the focal lengths of a concave lens for voilet and red light respectively, then we must have
- fV>fR and FV>FR
- fV<fR and FV>FR
- fV>fR and FV<FR
- fV<fR and FV<FR