Question

Which physical quantity indicates the degree of convergence or divergence of light
rays passing through a lens?

Answer 1

Answer:

Reflective index is that quantity which indicates the degree of convergence or divergence of light

Answer 2

Answer:

When the light rays passes towards the principal axis it is called convergence. when the light rays bends away from the principal axis it is called divergence.

The degree of convergence or divergence of a lens is determined by the power.

• When the focal length of the less is short it deviates the light.
• Thus the focal length of focal length is large it deviates less rays.
• The power and focal length are inversely proportional to one another.
• The physical quantity indicates the degree of convergence or divergence is REFRACTIVE INDEX.

Refractive index of a lens is determined as the ratio of speed of light in the vacuum to the speed of light passing through the lens.