Parallel rays of light entering a convex lens converge nbsp-at-Centre of curvature-Optical centre-Principal focus-Secondary focus-

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Standard IX

Physics

Focus of a Convex Lens

Parallel rays...

Question

Parallel rays of light entering a convex lens converge at:

Principal focus

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Secondary focus

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Centre of curvature

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Optical centre

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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

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

(a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram. (b) State whether concave lens has a real focus or a virtual focus. (c) List some things that concave lens and convex mirror have in common.

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

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Q. (a) What is meant by (i) principal focus of a convex mirror, and (ii) focal length of a convex mirror?
(b) Draw diagram to show the action of convex mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the convex mirror.

(a) With the help of a labelled diagram explain how a convex lens converges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the convex lens on the diagram.
(b) State whether the convex lens has a real focus or a virtual focus. (c) List some things that convex lens and concave mirror have in common.

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