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प्रश्न
In a reading glass what is the position of the object with respect to the concave lens used?
Why can't we use the concave lens to position the object in the reading glass?
उत्तर
A concave lens is a diverging lens that constantly forms a virtual, diminished picture. Therefore, using it for magnification was not possible.
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संबंधित प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and same size as the object?
A converging lens is used to produce an image of an object on a screen,object on a screen. What change is needed for the image to be formed nearer to the lens?
(a) increase the focal length of the lens
(b) insert a diverging lens between the lens and the screen
(c) increase the distance of the object from the lens
(d) move the object closer to the lens
Draw a diagram to show how a converging lens focusses parallel rays of light?
Copy and complete the diagram below to show what happens to the rays of light when they pass through the concave lens:
A ray of light is going towards the focus of a concave lens. draw a ray diagram to show the path of this ray of light after refraction through the lens.
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the nature of lens B?
The diagrams showing the correct path of the ray after passing through the lens are:
 |
 |
| I | II |
 |
 |
| III | IV |
An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm.
(i) What is the nature of the image so formed?
(ii) Calculate the distance of the image from the lens.
(iii) Calculate the magnification of the image.
Draw neat diagram to show the
Divergent action of concave lens
Define the principal focus of a concave lens.
