Which type of lenses are : (a) thinner in the middle than at the edges ? (b) thicker in the middle than at the edges ?

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Solution

Convex lens Concave lens

1. It is thick in the middle and thin at the edges

2. It converges the incident rays towards the principal axis.

3. It has a real 1. It is thin in the middle and thick at the edges

2. It diverges the incident rays away from the principal axis.

3. It has a virtual focus.

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Convex lens are the lens which are thicker in the middle and thinner at the edges.

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Convex lens	Concave lens
1. It is thick in the middle and thin at the edges 2. It converges the incident rays towards the principal axis. 3. It has a real	1. It is thin in the middle and thick at the edges 2. It diverges the incident rays away from the principal axis. 3. It has a virtual focus.