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प्रश्न
List some things that concave lens and concave mirror have in common.
उत्तर
Few things which are common to both a concave lens and a convex mirror are as follows:
- Both diverge a parallel beam of light.
- Both form a virtual image at all times.
- Both have a virtual focus.
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संबंधित प्रश्न
Explain with the help of a diagram, why the concave lens is also called a diverging lens.
Where must the object be placed for the image formed by a converging lens to be:
virtual, upright and larger than the object?
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.
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.
(a) Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from:
(i) a diverging lens of focal length 40 cm.
(ii) a converging lens of focal length 40 cm.
(b) Draw labelled ray diagrams to show the formation of images in case (i) and (ii) above (The diagrams may not be according to scale).
Name one of the common defects of vision and the type of lens used to remove it.
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.State three characteristics of the image.
A lens forms an upright and diminished image of an object irrespective of its position. What kind of lens is this?
Distinguish between concave and convex lens.
A parallel, oblique beam of light falls on a concave lens. Draw a diagram to show refraction of light through the lens.
