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प्रश्न
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.
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उत्तर
The object to be seen must be placed from the convex lens at a distance less than its focal length.
Characteristics of the image so formed are:
(i) It is virtual and upright.
(ii) It is magnified.
(iii) The image is formed towards the object side.
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संबंधित प्रश्न
The speed of light in air is 3 × 108 m s-1. Calculate the speed of light in glass. The refractive index of glass is 1.5
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Define the term magnifying power of a simple microscope. How does it depend on the focal length of the lens used?
Why is the focal length of the lens, used as a magnifying glass, kept short?
Will the image formed by a magnifying glass be real or virtual?
An object is placed in front of a lens between its optical centre and the focus and forms a virtual, erect, and diminished image. Draw a ray diagram to show the formation of the image with the above-stated characteristics.
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(i) Name the lens.
(ii) Draw a ray diagram to show the formation of the image with the above-stated characteristics.
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?
