The focal lengths of a thin convex lens are 1m and 0.968m for red and blue rays, respectively. Calculate the chromatic aberration and dispersive power of the material of the lens.

The focal lengths of a thin convergent lens are 0.5m and 0.484m for red and blue rays, respectively. Find the chromatic aberration and dispersive power of the material of the lens.

Focal lengths of a lens for violet, yellow and red colours are f_(v), f_(y) and f_(r) respectively. Calculate the dispersive power of the material of the lens.

The focal length of a lens is -0.4m. The lens is

The focal lengths of a thin convergent lens are 0.20m and 0.21m for voilet and red lights, respectively, An object is placed at a distance of 0.15m. Calculate the chromatic aberration in the image.

The focal lenghts of a convex lens for red, yellow and violet rays are 100cm, 99cm and 98 cm respectively. Find the dispersice power of the material of the lens.