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.

The focal lengths of a convex lens for red, yellow and violet rays are 100 cm, 98 cm and 96 cm respectively. Find the dispersive power of the material of the lens.

The focal lengths of a convex lens for red, yellow and violet rays are 100 cm, 98 cm and 96 cm respectively. Find the dispersive power of the material of the lens.

The focal lengths of a thin lens for red and violet light are 90.0 cm and 86.4cm respectively. Find the dispersive power of the material of the lens. Make appropriate assumptions.

The focal lengths of a thin lens for red and violet light are 90.0 cm and 86.4cm respectively. Find the dispersive power of the material of the lens. Make appropriate assumptions.

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 lengths of convex lens for red and blue light are 100 cm and 96.8 cm respectively. The dispersive power of material of lens is

The focal lengths of a thin convex lens for red and blue colour are 100.5 cm and 99.5 cm. The dispersive power of the lens is :