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Light - Reflection and Reflection
Which one of the following materials cannot be used to make a lens?
(a) Water (b) Glass (c) Plastic (d) Clay
Lens has a property that light pass through it. From the given options clay cannot be used to make lens because clay is opaque in nature which means light does not pass through it. The other options can be used to make lens as they are transparent or translucent in nature.
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