why the Ray of light not refracted when it passes through optical centre of a lens
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Deviation is the change in direction of the ray while passing through the lens. The middle portion of the lens is comparatively flat and there is a point on the principal axis and inside the sphere through which all the undeviated rays pass.
“Undeviated” doesn’t mean that there is no refraction. When we say that there is no deviation, we only mean that the incident ray and the emergent ray are parallel to each other. For thin lenses, the refraction inside the lens is negligible and therefore we represent the ray passing through the optic centre as a straight line. But in the case of a thick lens, we cannot do so.(see the image)
(P. S. ;Good Question by the way, keep asking, be curious and thanks for A2A)
For the ray of light to refract, it must follow law of refraction. Light falling on the optical centre of a spherical lens would imply it is falling perpendicularly on it. And therefore it doesn't gets refracted.
