Question

what happens after refraction, when:
(i)a ray of light parallel to the principal axis passes through a concave lens
(ii)a ray of light falls on a concave lens while passing through its principal focus
(iii)a ray of light passes through the optical centre of a convex lens ​

Answer 1

Answer:

1.  A ray of light parallel to the principal axis of the concave lens appears to be coming from focus after refraction through the lens. Rule 2: A ray of light passing through the optical centre of the concave lens goes straight after refraction through the lens.

2.A ray of light crossing through a principal focus, after refraction from a convex lens, will appear parallel to the principal axis. A ray of light developing to match at the principal focus of a concave lens, after refraction, will develop parallel to the principal axis.

3.A ray of light passing through the optical center suffers no refraction, that is, it passes undeviated. This is because, when it passes through the optical center, it is perpendicular to the curved surface of the lens. Hence, the angle of incidence is zero and therefore the angle of refraction is also zero.

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Answer 2

Explanation:

i)a ray of light parallel to the principal axis passes through a concave lens,then refracts and then appears to diverge from principal focus (on the same side of the lens in which the ray was initially travelling)

ii)a ray of light falls on a concave lens while passing through its principal focus,after refraction travels in a direction parallel to the principal axis.

iii)a ray of light which passes through the optical centre of a convex lens , after refraction does not deviate from its original path.