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प्रश्न
(i) Draw a ray diagram to show how the lens can be used as a ‘magnifying glass’? State the nature of the lens.
(ii) In what respect does the image in (i) above different from the image formed by a concave lens?
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उत्तर
(i) The nature of the lens used is convex. The image formed is magnified, virtual, and upright. In this case, a convex lens is said to be used as a ‘magnifying glass.’
(ii) Image formed by a concave lens differs from the image in size. It is much smaller in size.
संबंधित प्रश्न
A lens forms an erect, magnified and virtual image of an object.Draw a ray diagram to show the formation of image.
Ray diagram for the formation of image by a magnifying glass.
What information about the nature of image is real or virtual, do you get from the sign of magnification + or -?
An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to form the image of the object on a screen placed at a distance of 75 cm from the lens. Find:
- the focal length of the lens, and
- the magnification.
The magnification by a lens is -3. Name the lens and state how are u and v related?
What are conjugate foci?
Name the lens for which magnification can be 1. For what position of the object will the magnification be 1?
An object is placed in front of a lens between its optical centre and the focus and forms a virtual, erect, and diminished image. Draw a ray diagram to show the formation of the image with the above-stated characteristics.
An erect, magnified, and a virtual image is formed when an object is placed between the optical centre and principal focus of a lens.
(i) Name the lens.
(ii) Draw a ray diagram to show the formation of the image with the above-stated characteristics.
An object AB is placed between 2F1 and F1 on the principal axis of a convex lens as shown in the diagram. Copy the diagram and using three rays starting from point A, obtain the image of the object formed by the lens.
