Question

Give two uses of a convex lens.

Answer 1

Hint : Convex lenses have a positive focal length which means they are converging in nature. If an object is placed farther from the lens than the focal length, the image will be real and diminished in size.

Complete step by step answer:
Convex lenses are lenses that are converging in nature and their ends are narrow while the middle part is broader. Convex lenses are used in various ways such as in a microscope, magnifying glasses, camera, spectacles, etc.
One of the most direct and straightforward uses of a convex lens is in a magnifying glass. The magnifying glass has a convex lens so when the light enters the lens it becomes focused on a specific focal point in front of the centre of the lens, since convex lenses converge the light. Once the magnifying glass is placed at an optimal distance from the lens which is the focal point of the lens maximum magnification of the object will be done by the lens and can be observed by us.
In cameras, convex lenses are used widely. They help to focus on an image and also to magnify it. Almost all lenses of cameras consist of a convex lens followed by a concave lens, followed by a second convex lens. The first convex lens controls the magnification level of the image by moving away from or towards the object inside the camera. The action of changing the focal length inside the camera changes the distance between the distances of the lenses inside the camera to focus better on the object.

Note:
Many systems use a combination of lenses for their application. For example, camera lenses use multiple lenses and compound microscopes also use a set of two convex lenses to enlarge extremely tiny objects.