Fill in the following blanks with suitable words:(a) A convex lens _________ rays of light, whereas a concave lens _________ rays of light.(b) Lenses refract light to form images: a _________ lens can form both real and virtual images, but a perging lens forms only _________ images.

(a) A convex lens converges rays of light, whereas a concave lens diverges rays of light.

(b) Lenses refract light to form images: a converging lens can form both real and virtual images, but a diverging lens forms only virtual images.

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.

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.