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प्रश्न
The power of a lens is negative. State whether it is convex or concave.
उत्तर
It is a concave.
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संबंधित प्रश्न
Where must the object be placed for the image formed by a converging lens to be:
real, inverted and larger than the object?
Which type of lens is :
a converging lens, and which is
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 of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram.
Only one of the following applies to a concave lens. This is:
(a) focal length is positive
(b) image distance can be positive or negative
(c) height of image can be positive or negative
(d) image distance is always negative
Complete the following sentence:
A short-sighted person cannot see ............ objects clearly. Short-sightedness can be corrected by using ........... lenses.
Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.
A concave lens, if kept at a proper distance from an object, can form its real image.
A concave lens forms a magnified or diminished image depending on the distance of an object from it.
Copy the following figure and complete it to show the formation of the image of the object AB. Name the lens used in the figure.
