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प्रश्न
Explain with the help of a diagram, why the concave lens is also called a diverging lens.
उत्तर
A concave lense is curved inwards. Light passing through it diverges or spreads out. Think of a flashlight. The light from the small bulb passes through the lens and spreads out into a bigger beam on the other side. See the diagram given below.
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संबंधित प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
virtual, upright and larger than the object?
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.
When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same object is placed 10 cm in front of lens B, the image formed is real, inverted and same size as the object.
What is the nature of lens A?
A concave lens of 20 cm focal length forms an image 15 cm from the lens. Compute the object distance.
Complete the following sentence:
A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
A lens forms an upright and diminished image of an object irrespective of its position. What kind of lens is this?
The power of a lens is negative. State whether it is convex or concave.
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is :
Define the principal focus of a concave lens.
Give two characteristics of the image formed by a concave lens.
