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प्रश्न
State two uses of magnifying glass.
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उत्तर
- It is used to see and read the small letters and figures.
- It is used by watchmakers to see the small parts and screws of the watch.
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संबंधित प्रश्न
A lens forms an erect, magnified, and virtual image of an object. Name the device which uses this principle.
What is a magnifying glass?
Ray diagram for the formation of image by a magnifying glass.
If the magnification produced by a lens is - 0.5, the correct statement is ______.
An illuminated object lies at a distance 1.0 m from a screen. A convex lens is used to form the image of the object on a screen placed at a distance of 75 cm from the lens. Find:
- the focal length of the lens, and
- the magnification.
Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?
Define magnification produced by a lens. State its unit.
Copy and complete the following ray diagram.
An erect, magnified, and a virtual image is formed when an object is placed between the optical centre and principal focus of a lens.
(i) Name the lens.
(ii) Draw a ray diagram to show the formation of the image with the above-stated characteristics.
(i) Draw a ray diagram to show how the lens can be used as a ‘magnifying glass’? State the nature of the lens.
(ii) In what respect does the image in (i) above different from the image formed by a concave lens?
