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

Materials that allow light to pass through completely 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_____

Refraction of light passing through a glass slab.

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

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.

A narrow beam of light passes through a slab obliquely and is then received by an eye. The index of refraction of the material in the slab fluctuates slowly with time. How will it appear to the eye? The twinkling of stars has a similar explanation.

What are partially polarised light ?