Question

A ray of light after refraction through a lens emerges parallel to the principal
axis of the lens. The incident ray either passes through or appears to meet at
(A) Optical centre
(B) First focus
(C) Second focus
(D) Centre of curvature of the first surface
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Answer 1

Answer:

ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray either passes through : its optical centre. its first focus.

Answer 2

Answer:

b) at first focus.

Explanation:

A ray of light after refraction through lens emerges parallel to the principal axis of the lens.

The incident ray either passes through or appears to meet at first focus.