Astigmatism, Spherical aberration and Comatic Aberration

1. The marginal rays are focus at the near point of the lens where as the paraxial rays are co...}
   Akshamala

Aberration And Chromatic aberration

1.Derivation of the image formed by the lens from its actual shape, size and position is called a...}

Akshamala

Ramsden's Eye-piece

1. Cross-wire can be used because the image formed bythe objective lies in front of the field...}
   Akshamala

Huygen's Eye-piece

1. Eye-piece is the system of two co - axial lenses having definite focal length and seperated...}
   Akshamala

Achromatism and Achromatic Lenses

1. Using a suitable combination of two or more lenses of different materials, th...}
   Akshamala

Distortion, Curvature of Field, Longitudinal Chromatic Aberration for an Object at Finite Distance

1. . A careful study shows that the image of an extended plane object is curved....}
   Akshamala