Which of the following statements are correct?

A. Dispersion is the splitting of light into it's constituent colours.
B. The unit for power of a lens is m^-1.
C. Optical fibres consist of glass fibres coated with a thin layer of material of higher refractive index.
D. Cassegrain telescope has the advantages of a large focal length in a short telescope.
E. Glass is a dispersive medium.

Choose the correct answer from the options given below:

A, B, D and E Only

Dispersion is the splitting of light into it's constituent colours.

$ P = \frac{1}{F} \Rightarrow $ The unit for power of a lens is $m^{-1}.$

Optical fibers typically include a core surrounded by a transparent cladding material with a lower index of refraction.

In Cassegrain Telescope , design allows for a long focal length of a concave mirror to be within a smaller tube or telescope because the convex secondary lens allows for the focal point to be conveniently behind the primary mirror where an eyepiece can be placed.

glass is a dispersive medium.