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प्रश्न
The magnification by a lens is -3. Name the lens and state how are u and v related?
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उत्तर
The negative value of magnification suggests that image is real and inverted. The magnitude of magnification is greater than 1 which means image is enlarged. Therefore the lens should be convex lens.
Relation between u and v is given by
m = `"v"/"u"`
`-3 = "v"/-"u"`
v = 3 u
This shows that image distance is 3 times that of object distance.
संबंधित प्रश्न
The following diagram shows an object AB and a converging lens L with foci F1 and F2 State three characteristics of the image in relation to the object.
What is 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.
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Will the image formed by a magnifying glass be real or virtual?
What information we seek by the linear magnification of the image when it is positive or negative?
Name the lens for which magnification is always less than 1.
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?
Write an expression for the magnifying power of a simple microscope. How can it be increased?
State two uses of magnifying glass.
