Q36 of 284 Page 241

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

Water, glass and plastic reflect light, but clay does not as it is opaque.

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34

Name one simple optical instrument in which the above arrangement of convex lens is used.

 35

A convex lens has a focal length of 10 cm. At which of the following position should an object be placed so that this convex lens may act as a magnifying glass?

 37

A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:

 38

An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is: