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Construct ray diagrams to illustrate the formation of a virtual image using a diverging lens.
(a) Find the position and size of the virtual image formed when an object 2 cm tall is placed 20 cm from:
(i) a diverging lens of focal length 40 cm.
(ii) a converging lens of focal length 40 cm.
(b) Draw labelled ray diagrams to show the formation of images in case (i) and (ii) above (The diagrams may not be according to scale).
What kind of lens is used to correct
short-sightedness
Where will the image be formed if an object is kept in front of a concave lens at a distance equal to its focal length? Draw a ray diagram to illustrate your answer.
A concave lens, if kept at a proper distance from an object, can form its real image.
The power of a lens is negative. State whether it is convex or concave.
If the image formed by a lens is diminished in size and erect, for all positions of the object, what type of lens is it?
A student obtained clear image of window grills on the screen. But the teacher told him to get the image of a tree far away, instead of window. To get a clear image, the lens must be ............................
Define the term principal foci as applied to a concave lens. Illustrate your answer with the aid of proper diagrams. Show the focal length of the lens in the diagram.
The focal length of a lens is negative. In this case, state the kind of lens.
