3) Use the data obtained by activity-2 in table-1 of this lesson and draw the graphs of u vs v and 1/u vs 1/v. (AS)

4) Figure-4 shows ray AB that has passed through a divergent lens. Construct the path of the ray up to the lens if the position of its foci is known. (AS)

5) Figure-5shows a point light source and its image produced by a lens with an optical axis N,N. Find the position of the lens and its foci using a ray diagram. (AS)



6) Find the focus by drawing a ray diagram using the position of source S and I the image S' given in the figure-6. (AS)

7) A parallel beam of rays is incident on a convergent lens with a focal length of 40cm. Where a divergent lens with a focal length of 15 cm should be placed for the beam of rays to remain parallel after passing through the two lenses? Draw a ray diagram. (AS)

8) The distance between two point sources of light is 24cm. Where should a convergent lens with a focal length of f=9cm be placed between them to obtain the images of both sources at the same point? (AS.)

9) Suppose you are inside the water in a swimming pool near an edge. A friend is standing on the edge. Do you find your friend taller or shorter than his usual height? Why? (AS)

Multiple choice questions


1) Which one of the following materials cannot be used to make a lens?

a) water     b) glass     c) plastic     d) clay

2) Which of the following is true?

a) the distance of virtual image is always greater than the object distance for convex lens

b) the distance of virtual image is not greater than the object distance for convex lens

c) convex lens always forms a real image

d) convex lens always forms a virtual image


page no:79

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