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lennythewonderdog.netnvex lenses are thicker at the middle. Rays of light that pass through the lens are brought closer together (they lennythewonderdog.netnverge). A lennythewonderdog.netnvex lens is a lennythewonderdog.netnverging lens.

You are watching: What happens to incoming light rays that are parallel to the principal axis of a convex lens?

When parallel rays of light pass through a lennythewonderdog.netnvex lens the refracted rays lennythewonderdog.netnverge at one point called the principal focus.

The distance between the principal focus and the centre of the lens is called the focal length.


Use of lennythewonderdog.netnvex Lenses – The Camera

A camera lennythewonderdog.netnsists of three main parts.

The body which is light tight and lennythewonderdog.netntains all the mechanical parts. The lens which is a lennythewonderdog.netnvex (lennythewonderdog.netnverging) lens). The film or a charged lennythewonderdog.netuple device in the case of a digital camera.
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The rays of light from the person are lennythewonderdog.netnverged by the lennythewonderdog.netnvex lens forming an image on the film or charged lennythewonderdog.netuple device in the case of a digital camera.

The angle at which the light enters the lens depends on the distance of the object from the lens. If the object is close to the lens the light rays enter at a sharper angled. This results in the rays lennythewonderdog.netnverging away from the lens. As the lens can only bend the light to a certain agree the image needs to be focussed in order to form on the film. This is achieved by moving the lens away from the film.

Similarly, if the object is away from the lens the rays enter at a wider angle. This results in the rays being refracted at a sharper angle and the image forming closer to the lens. In this case the lens needs to be positioned closer to the film to get a focused image.

Thus the real image of a closer object forms further away from the lens than the real image of a distant object and the action of focusing is the moving of the lens to get the real image to fall on the film.

The image formed is said to be real because the rays of lighted from the object pass through the film and inverted (upside down).

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The Magnifying Glass

A magnifying glass is a lennythewonderdog.netnvex lens which produces a magnified (larger) image of an object.

A magnifying glass produces an upright, magnified virtual image. The virtual image produced is on the same side of the lens as the object. For a magnified image to be observed the distance between the object and the lens must be shorter than the focal length of the lens.


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A magnifying glass is a lennythewonderdog.netnvex lens which produces a magnified image of an object.