Question

define (i) refracting surface and (i) optical density​

Answer 1

Answer:

• Refraction is the deflection of a ray of light as a result of passing from one medium to another of different optical density (refractive index). ... The cornea is the most powerful refracting surface of the human eye, because of the large difference in the refractive index between the air and the cornea.

• The optical density of a material is a logarithmic ratio of the falling radiation to the transmitted radiation through a material. It is also referred as a fraction of absorbed radiation at a particular wavelength.

Answer 2

(i) Refracting surface:

Refraction is the deflection of a ray of light as a result of passing from one medium to another of different optical density( refractive index). The surface at which light gets refracted is called refracting surface.

(ii) Optical density:

It is a lagorithmic measure of the power attenuation, or alternatively of refractive index.

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