Question

3. A ray of light after refraction through a lens emerges parallel to its principal axis of
the lens. The incident ray either passes through or appear to meet at

a optical centre
b. first focus
C. second focus
d. centre of curvature of the first surface​

Answer 1

Answer:

first focus

Explanation:

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Answer 2

Answer:

first focus

Explanation:

you can just find it in NCERT in the formation of image by lenses it clearly states that any ray passing through focus in case of convex or principal focus in case of concave emerge parallel to the principal axis also you can see diagrams there to understand better page 180 point (ii) at the top