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प्रश्न
A lens forms an upright and diminished image of an object irrespective of its position. What kind of lens is this?
उत्तर
Concave lens
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संबंधित प्रश्न
Take down this figure into your answer book and complete the path of the ray.
An object lies at a distance of 2f from a concave lens of focal length f. Draw a ray-diagram to illustrate the image formation.
What is the difference between the two images formed above?
Which of the following can form a virtual image which is always smaller than the object?
(a) a plane mirror
(b) a convex lens
(c) a concave lens
(d) a concave mirror
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
Name one of the common defects of vision and the type of lens used to remove it.
- Name the lens which always forms an erect and virtual image.
- State whether the image in part (a) is magnified or diminished.
A concave lens has a focal length 30 cm. Find the position and magnification (m) of the image for an object placed in front of it at distance 30 cm. State whether the image is real or virtual?
An object is placed in front of a lens between its optical centre and focus. The formed image is virtual, erect, and diminished. Name the lens used.
