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प्रश्न
If the image formed by a lens is diminished in size and erect, for all positions of the object, what type of lens is it?
उत्तर
If the image formed by a lens is diminished in size and erect, for all positions of the object, then the lens is a concave lens.
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संबंधित प्रश्न
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.
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.
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.
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.
A concave lens has focal length 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.
Complete the following sentence:
A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
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.
How will you differentiate between a convex and a concave lens by looking at
- a distant object,
- a printed page?
In a reading glass what is the position of the object with respect to the concave lens used?
