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Which type of lenses are:(a) thinner in the middle than at the edges?(b) thicker in the middle than at the edges?
(a) A concave lens is thinner in the middle than at the edges.
Explanation
Diverging Lens or Concave Lens $-$ It is a lens that possesses at least one surface that curves inwards in the middle. In other words, it is thin across the middle and thick at the upper and lower edges, because of which the light that enters the lens, gets spread out, or diverges, which results in forming a smaller image. Due to this effect, it is also called a negative lens or a diverging lens.
The image formed by a concave lens is virtual & erect, which means it will appear to be farther away than it actually is, and therefore smaller than the object itself.
(b) A convex lens is thicker in the middle than at the edges.
Explanation
Converging Lens or Convex Lens $-$ It is a lens that possesses at least one surface that curves outwards. In other words, it is thick across the middle and thin at the upper and lower edges., because of which the light that enters the lens, gets focused, or converged. Due to this effect, it is also known as a positive lens or a converging lens.
The image formed by a convex lens is both real and virtual depending on the position of the object, which means both diminished and magnified images can be produced.
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