Which one of the following materials cannot be used to make a lens?
(a) Water
(b) Glass
(c) Plastic
(d) Clay
(d) A lens allows lightto pass through it. Since clay does not show such property, it cannotbe used to make a lens.
Which of the following materials can be used to make a convex lens?
Which of the following materials can be best used to make a lightning conductor?
Ram wants to make a magnet. Which one of these materials can he not use ?