Question

Expkain the terms :


1. Convex Lens

2. Concave Lens

3. Focal Length

50 points (:​

Answer 1

Answer:

Convex lens

A convex lens is thicker at the centre than at the edges. ... Rays of light that pass through the lens are brought closer together (they converge). A convex lens is a converging lens.

Concave lens

A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it.

Focal length

The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). In the case of zoom lenses, both the minimum and maximum focal lengths are stated, for example 18–55 mm.

Answer 2

Answer:

CONCAVE LENS: A LENS THAT IS THINNER AT ITS CENTRE THAN AT THE EDGES I S CALLED CONCAVE LENS.

CONVEX LENS:A LENS THAT IS THICKER AT ITS CENTRE THAT AT THE EDGES IS CALLED CONVEX LENS.

FOCAL LENGTH: IT IS THE DISTANCE BETWEEN THE PRINCIPAL FOCUS (F) AND THE OPTICAL CENTRE (0) OF A LENS.

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