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प्रश्न
A convex lens produces on a screen an image twice the size of the object. If the position of image and object be interchanged, what will be the magnification then?
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उत्तर
On interchanging the position of image and object, the magnification will be 1/2.
संबंधित प्रश्न
A lens forms an erect, magnified, and virtual image of an object. Name the device which uses this principle.
Define magnifying power of a simple microscope. How can it be increased?
Ray diagram for the formation of image by a magnifying glass.
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?
Why is the focal length of the lens, used as a magnifying glass, kept short?
Show with the help of a ray diagram, the path of the ray when incident normally on the first surface of the glass block, through the block and the liquid.
Draw a neat diagram to explain the action of a convergent (convex) lens as a reading glass (or magnifying glass). State the characteristics of the image formed.
(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?
