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प्रश्न
Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?
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उत्तर
The magnifying power of a simple microscope is defined as the ratio of the angle subtended by the image at the eye to the angle subtended by the object at the eye if it is assumed to be placed at the least distance of distinct vision.
Shorter the focal length of the lens used, larger is its magnifying power.
संबंधित प्रश्न
The following diagram shows an object AB and a converging lens L with foci F1 and F2. Draw two rays from the object AB and complete the diagram to locate the position of the image CD. Also mark on the diagram the position of eye from where the image can be viewed.
A lens forms an erect, magnified and virtual image of an object.Draw a ray diagram to show the formation of image.
A lens forms an erect, magnified, and virtual image of an object. Name the device which uses this principle.
Draw a neat labelled ray diagram to show the formation of an image by a magnifying glass. State three characteristics of the image.
What information about the nature of image is real or virtual, do you get from the sign of magnification + or -?
What are conjugate foci?
What information we seek by the linear magnification of the image when it is positive or negative?
What is a simple microscope or a magnifying glass? Draw a ray diagram to show its function.
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?
