Question

state two differences between a convex and concave lens​

Answer 1

Answer:

A convex lens is thicker at the centre and thinner at the edges. A concave lens is thicker at the edges and thinner at the centre. Due to the converging rays, it is called a converging lens. Due to the diverging rays, it is called a diverging lens.

Answer 2

Difference between convex and concave lens:

1. On passing the light through a convex lens, the light beams meet at one point; it means they converge and so it is a convergent lens. While on passing the light through a concave lens, light beams diverge and are known as diverging lenses.

2. A convex lens has thin edges with a thicker centre while a concave lens has thick edges with thinner centre.

3. Due to the positive focal length convex lens is termed as positive lens while due to the negative focal length concave lens is termed as negative lens.

4. Convex lens is useful to cure long-sightedness and a concave lens is used to cure short-sightedness.

Note: Always remember both the lenses by remembering the convex and concave mirrors. Convex mirror diverges the light while a convex lens converges the light. Concave mirror converges the light while a concave lens diverges the light. So, it is easy to remember, one can only keep the information about the mirror and according to that, but in opposite characteristics, remember the lens.