Materials that allow light to pass through completely are known as ----materials.

Materials that allow light to pass through partially are known as ---materials.

Material that are not able to allow light to pass through it are called ------ materials

Paper is not a ___material.

Substances which allow heat to pass through them are called_____

____ are the materials which allow electric current to pass through them.

Refraction of light passing through a glass slab.

The phenomenon observed when a beam of light is passed through a colloidal solution is

A thin prism is made of a material having refractive indices 1.61 and 1.65 for red and violet light. The dispersive power of the material is 0.07. It is found that a beam of yellow light passing through the prism suffers a minimum deviation of 4.0^@ in favourable conditions. Calculate the angle of the prism.