Question

How can the distance of the lens from the film be changed?

Answer 1

Let’s get some idea about lens. A lens is a transmissive optical device that employs refraction to focus or disperse a light beam. A simple lens is made up of a single transparent piece, whereas a compound lens is made up of numerous simple lenses (elements) that are usually aligned along a common axis. Lenses are made of materials like glass or plastic that are ground and polished or moulded into the correct shape.

Complete step-by-step solution:
Unlike a prism, which refracts light without concentrating, a lens can concentrate light to form an image. Microwave lenses, electron lenses, acoustic lenses, and explosive lenses are examples of devices that focus or disperse waves and radiation other than visible light in the same way.
A focussing ring can be used to adjust the distance between the lens and the film. The focal length of the camera lens is fixed. When the object's distance is altered, the image distance is changed by moving the lens. The image distance, or the distance between the lens and the retina, is fixed in the human eye, hence this cannot be done.

Note: Let’s see the different uses of lens.Various image devices, such as telescopes, binoculars, and cameras, require lenses. They're also utilised in spectacles as visual aids to correct vision problems including myopia and hypermetropia.