A glass lens is immersed in water. How is power of the lens affected? Justify your answer.

Define power of a lens

…is the unit of power of the lens

A glass prism is held in water. How is its angle of minimum deviation affected?

A glass prism is held in water. How is its angle of minimum deviation affected?

Define 1 dioptre of power of a lens

Define 1 dioptre of power of a lens

Define the term 'resolving power of a telescope'. How will the resolving power be affected with the increase in Diameter of the objective lens? Justify your answer.

How does magnifying power of a telescope change on decreasing the aperture of its objective lens?Justify your answer.

How will the magnifying power of a refracting type astronomical telescope be affected on increasing for its eye piece the aperture?Justify your answer.