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Q.

The Principal ____ of a lens is the point through which a parallel light passes after refraction.


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Detailed Solution

The principal focus of a lens is the point through which a parallel light passes after refraction.
In the case of a convex lens, the principal focus is on the right side of the lens, and in the case of a concave lens, the principal focus is on the left side of the lens. Considering the usual sign conventions where the incident light is coming from the left side.
 
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