Q50 of 284 Page 242

How would you alter the above diagram to show how a converging lens can produce a beam of parallel rays of light?

we can alter the above diagram to show how a converging lens can produce a beam of parallel rays of light by Placing a source of light at the focus of the converging lens.


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49

When an object is placed at a distance of 40 cm from a convex lens, an image of the same size as the object is formed. What will be the nature of image formed when the object is placed at a distance of?

(a) 10 cm from the lens?


(b) 20 cm from the lens?

 50

Draw a diagram to show how a converging lens focusses parallel rays of light.

 1

Write the formula for a lens connecting image distance (), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?

 2

Write down the magnification formula for a lens in terms of object distance and image distance. How does this magnification formula for a lens differ from the corresponding formula for a mirror?