Which type of lens will you apply for reading small letters of a dictionary?

A magnifying glass is a convex lens that magnifies an object to make it appear much larger than it is. When the object is put closer to the lens than the focus length, this works. Therefore, to read small letters in the dictionary, we need to use a magnifying lens which is convex lens.

Which mirror is used in the headlight of vehicles?

The headlights of a vehicle have a concave mirror. It is employed because when a headlight bulb is placed at the focus concave mirror/lens, the light is allowed to spread to its utmost extent and a parallel ray of light is produced. A concave mirror, or converging mirror, has a reflecting surface that is recessed inward.

An object of 7 cm height is placed at a distance of 12 cm from a convex lens of focal length 8 cm . Find the position, nature and height of the image.

The distance between the image and the lens are referred to as the image's position. As a result, the image is formed on the convex lens's right side. On the right side of a convex lens, only a real and inverted image is generated. As a result, the image's height or size is 14 cm .