Question

Difference between convex and concave lens​

Answer 1

Answer:

Convex lens: Concave lens:

(1)The converging lens in air. (1)The diverging lens in air.

(2)The principal focus behind the lens. (2)Principal focus is infront of lens.

(3)Used as magnifying lens. (3)Used in projectors.

(4)Forms both real and virtual images. (4)Only form virtual image.

Answer 2

Concave lens:

1) It has both surfaces curving inwards.

2) It is thicker at edges and thinner at middle.

3) It diverges the light coming towards it.

4) Its focal length is negative.

5) It always produces a virtual image.

Convex lens:

1) It has both surfaces curving outwards.

2) It is thicker at middle and thinner at the edges.

3) It converges the light coming towards it.

4) Its focal length is positive.

5) It always produces a real image and forms a virtual image only when the object is between the focus and optical centre.

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