1.

A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray passes through : (a) its optical centre (b) its first focus (c) its second focus (d) the centre of curvature of the first surface.

Answer»

A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray passes through :

(a) its optical centre

(b) its first focus

(c) its second focus

(d) the centre of curvature of the first surface.



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