Fill in the following blanks with suitable words:

(a) A ________ lens converges rays of light, whereas a ____ lens diverges rays of light.

(b) Lenses refract light to form images: a _______ lens can form ______ images, but a diverging lens forms only ______ images.

What type of image is always made by a concave lens?

Take down this figure into your answer book and complete the path of the ray

Things always look small on viewing through a lens. What is the nature of the lens?

An object lies at a distance of 2f from a concave lens of focal length f. Draw a ray-diagram to illustrate the image formation.