Question

A small electric lamp is placed at the focus of a convex lens when the lamp is switched on the lens will produce

Answer 1

Parallel rays, focused and never meet at any point.

Explanation:

When a light source is placed at the focus of a convex lens it produces a parallel beam of light which will continue till infinity and never meet actually.

Any object when placed at the focus of a convex mirror has its image at infinity, real, inverted and highly magnified.

• For demonstration we can assume one ray to be passing through optical center of the lens which goes undeviating through the lens and the other ray to be parallel to the principle axis which on refraction passes through the focus on the other side and we get two parallel rays from the other side of the lens.

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TOPIC: convex lens

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