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प्रश्न
In a reading glass what is the position of the object with respect to the concave lens used?
Why can't we use the concave lens to position the object in the reading glass?
उत्तर
A concave lens is a diverging lens that constantly forms a virtual, diminished picture. Therefore, using it for magnification was not possible.
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संबंधित प्रश्न
List some things that concave lens and concave mirror have in common.
If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19 cm from the lens, the image formed is slightly larger than object. The approximate focal length of the lens is ______.
What type of image is always made by a concave lens?
A beam of light is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the following figure:
The box contains:
(a) a glass prism
(b) a concave lens
(c) a convex lens
(d) a parallel-sided glass slab
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Draw a ray diagram to justify your answer for the above situation and label it.
An object of height 4 cm is kept at a distance of 30 cm from a concave lens. Use lens formula to determine the image distance, nature and size of the image formed if focal length of the lens is 15 cm.
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?
A lens forms an image between the object and the lens. Name the lens.
