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

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 length of a lens for red and violet colours are 16.4 cm and 16 cm. What is its dispersive power ?

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.

When a parallel beam of light passes through a convex lens , red, yellow and blue colours are focussed at 19.5, 20.0 and 20.5 cm. The dispersive power of the material of prism is :

For a thin convex lens the’focal length for red and blue light is 1.005 m and 0.995 m respectively. What is the dispersive power for that lens medium?