Advertisements
Advertisements
प्रश्न
State two applications of a concave lens.
उत्तर
- A person suffering from short-sightedness or myopia wears spectacles having a concave lens.
- A concave lens is used as an eye lens in a Galilean telescope to obtain an erect final image of the object.
संबंधित प्रश्न
If the numerical value of the power of this lens is 10 D, what is its focal length in the Cartesian system ?
Things always look small on viewing through a lens. What is the nature of the lens?
Give the position, size and nature of image of formed by a concave lens when the object is placed:
anywhere between optical centre and infinity.
Which type of lens is
a diverging lens? Explain your answer with diagrams.
With the help of a diagram, explain why the image of an object viewed through a concave lens appears smaller and closer than the object.
State one practical use each of convex mirror, concave mirror, convex lens and concave lens.
The diagrams showing the correct path of the ray after passing through the lens are:
 |
 |
| I | II |
 |
 |
| III | IV |
An object is placed in front of a lens between its optical centre and focus. The formed image is virtual, erect, and diminished. Name the lens used.
If the power of a lens is -4.0 D, then it means that the lens is a ______.
Give two characteristics of the image formed by a concave lens.
