Q33 of 284 Page 240

Three convex lenses are available having focal lengths of 4 cm, 40 cm and 4 m respectively. Which one would you choose as a magnifying glass and why?

Convex lens having 4 cm focal length should be chosen because it will produce greatest magnification.


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33

Explain what is meant by a virtual, magnified image.

 33

Draw a ray diagram to show the formation of a virtual magnified image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.

 34

Explain why, a real image can be projected on a screen but a virtual image cannot.

 34

Draw a ray diagram to show the formation of a real diminished image of an object by a convex lens. In your diagram, the position of object and image with respect to the principal focus should be shown clearly.