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Q.

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


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a

Glass

b

Plastic

c

Clay

d

water 

answer is C.

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Detailed Solution

Clay cannot be used to make a lens.
The lens is a material that converges or diverges the light falling on its surface. They do so by the reflection of the image. Since reflection of light is only possible in a transparent material, lenses are only made with transparent material. Of the given options, clay is not a transparent material; hence, it cannot be used to make a lens.
On the other hand, glass, plastic and water are transparent materials and are used for making lenses.
 
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