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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Solution

If a ray passes through the first focus of a convex lens, after refraction it emerges parallel to the principal axis. So, the correct choice is (b).

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Similar questions

A ray light incident on a lens parallel to its principal axis, after refraction passes through or appears to come from :

(a) its first focus

(b) its optical centre

(d) the centre of curvation of its second surface.

Q. The figure shows a ray of light incident on a convex lens, parallel to its principal axis. Obviously the emergent ray passes through the principal focus F. Which of the following statements is correct?

Q. A ray of light parallel to the principal axis, after refraction passes through the focus of a convex lens.

For an incident ray directed towards centre of curvature of a spherical mirror, the reflected ray :

(a) retraces its path

(b) passes through the focus

(d) becomes parallel to the principal axis.

A ray of light after refraction through a convex lens emerges parallel to the principal axis. (a) Draw a ray diagram to show it. (b) The incident ray passes through a point F on the principal axis. Name the point F.

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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.

If a ray passes through the first focus of a convex lens, after refraction it emerges parallel to the principal axis. So, the correct choice is (b).

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.