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Image Formation by Lenses

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Question

Question 9

The image formed by a lens is always virtual, erect and smaller in size for an object kept at different positions in front of it. Identify the nature of the lens.

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Solution

Irrespective of the object position, the image formed by the concave lens is always virtual, erect and smaller in size.

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Similar questions

When an object is kept at any distance in front of a concave lens, the image formed is always : (a) virtual, erect and magnified (b) virtual, inverted and diminished. (c) virtual, erect and diminished (d) virtual, erect and same size as object

Describe with the help of a ray-diagram, the size, nature and position of the image formed by a convex lens when an object is placed beyond 2f in front of the lens.

Q. If the image formed by a lens for all positions of an object placed in front it is always erect and diminished What is the nature of this lens? Draw a ray diagram to justify your answer. If the numerical value of the power of this lens of 10 D, What is its focal length in the Cartesian system ?

Q. (a) Draw ray diagrams to show the formation of a three times magnified (i) real image (ii) virtual image, of an object kept in front of a converging lens. Mark the positions of object, F, 2F, O and position of image clearly in the diagram.
(b) An object of size 5 cm is kept at a distance of 25 cm from the optical centre of a converging lens of focal length 10 cm. Calculate the distance of the image from the lens and size of the image.

Q. The nature of the virtual image of an object formed in a concave lens is:

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Image Formation by Lenses

Standard VII Physics

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