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प्रश्न
Study the diagram below.
- Name the lens LL’.
- What are the points O and O' called ?
- Complete the diagram to form the image of the object AB.
- State three characteristics of the image.
उत्तर
- LL' is concave lens.
- O and O' are called the first and second focal points, respectively.
- The three characteristics of the image are virtual, erect and diminished.
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संबंधित प्रश्न
An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:
(a) upright and magnified
(b) inverted and magnified
(c) inverted and diminished
(d) upright and diminished
Which type of lens is :
a converging lens, and which is
An object is placed at a distance of 4 cm from a concave lens of focal length 12 cm. Fine the position and nature of the image.
The diagrams showing the correct path of the ray after passing through the lens are:
 |
 |
| I | II |
 |
 |
| III | IV |
An object of height 4 cm is kept at a distance of 30 cm from a concave lens. Use lens formula to determine the image distance, nature and size of the image formed if focal length of the lens is 15 cm.
A lens forms an image between the object and the lens. Name the lens.
Do we expect any change in the position, nature, and size of the image
(i) formed by a concave lens,
(ii) with a change in the position of the object?
Define the principal focus of a concave lens.
Draw images in case of a concave lens when the object is at infinity.
A parallel, oblique beam of light falls on a concave lens. Draw a diagram to show refraction of light through the lens.
