Advertisements
Advertisements
प्रश्न
A lens forms an upright and diminished image of an object, irrespective of its position. What kind of lens is this? Draw an outline ray diagram to show the formation of the image. State the position and one more characteristic of the image.
Advertisements
उत्तर
A concave (or diverging) lens forms an upright and diminished image of an object irrespective of its position.
The outline ray diagram showing the formation of the image is given in figure. For the object AB, the image is A’B’.
The image is formed between optical centre O and focus F, in front of the lens.
The image is virtual.
APPEARS IN
संबंधित प्रश्न
How unit of power related to focal length of a lens?
How is the power of a lens related to its focal length?
What is the power of a convex lens of focal length 0.5 m?
A combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and 40 cm and a diverging lens of focal length 50 cm. Find the power and focal length of the combination.A optical instrument in which the above arrangement of convex lens is used is a convex lens used to burn paper by focusing sunlight.
Surabhi from std. X uses spectacle. The power of the lenses in her spectacle is 0.5 D.
Answer the following questions from the given information:
- Identify the type of lenses used in her spectacle.
- Identify the defect of vision Surabhi is suffering from.
- Find the focal length of the lenses used in her spectacle.
How is accommodation produced?
The power of a lens is +2.0 D. Find its focal length and state the kind of lens.
If the lens is of focal length 25 cm. Calculate the power of the lens.
Increase in the converging power of eye lens cause ‘hypermetropia'
The power of convex lens of focal length 20 cm is ______.
