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 ?
Fill in the following blank with suitable word:
Lenses refract light to form images: a..................... lens can form both real and virtual images, but a diverging lens forms only ...................... images.
Things always look small on viewing through a lens. What is the nature of the lens?
An object is placed 10 cm from a lens of focal length 5 cm. Draw the ray diagrams to show the formation of image if the lens is diverging.
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.
The following diagram in given below shows an object OA and its virtual image IB formed by a lens.
An object is placed on the axis of a lens. An image is formed by refraction in the lens. For all positions of the object on the axis of the lens, the positions of the image are always always between the lens and the object name the lens.
A lens forms an upright and diminished image of an object irrespective of its position. What kind of lens is this?
A concave lens, if kept at a proper distance from an object, can form its real image.
Define the term principal foci as applied to a concave lens. Illustrate your answer with the aid of proper diagrams. Show the focal length of the lens in the diagram.
