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प्रश्न
Why is the focal length of the lens, used as a magnifying glass, kept short?
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उत्तर
The focal length of the lens used as a magnifying glass is kept small to increase its magnifying power.
संबंधित प्रश्न
A lens forms an erect, magnified, and virtual image of an object. Where is the object placed in relation to the lens?
What is a magnifying glass?
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.
A convex lens produces on a screen an image twice the size of the object. If the position of image and object be interchanged, what will be the magnification then?
Show with the help of a ray diagram, the path of the ray when incident normally on the first surface of the glass block, through the block and the liquid.
Draw a neat diagram to explain the action of a convergent (convex) lens as a reading glass (or magnifying glass). State the characteristics of the image formed.
Copy and complete the following ray diagram.
An object AB is placed between 2F1 and F1 on the principal axis of a convex lens as shown in the diagram. Copy the diagram and using three rays starting from point A, obtain the image of the object formed by the lens.
Write an expression for the magnifying power of a simple microscope. How can it be increased?
