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CBSE--class10--Science-2016-->View question

A student obtained a sharp inverted image of a distant tree on the screen placed behind a convex lens. He then removed the screen and tried to look through the lens in the direction of the object. He would now observe: CBSE class10 Science 2016

(a) A blurred image on the wall of the laboratory
(b) An erect image of the tree on the lens
(c) No image as the screen has been removed
(d) An inverted image of the tree at the focus of the lens


Asked On2017-07-12 15:46:03 by:Fututron

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(d)
As the convex lens forms an image of a distant tree, it will focus the light rays
on its focal point. Hence, if the student is viewing through the lens, an inverted
image of the tree will be obtained at the focus of the lens. This image will now
be projected on the retina of the eye.

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or moulded to a desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called lenses, such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.


Answerd on:2017-07-13 Answerd By:13priya

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