Question 1
Which one of the following materials cannot be used to make a lens?

(a) Water
(b) Glass
(c) Plastic
(d) Clay

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Solution

(d) Clay

A lens allows light to pass through it. Since clay is completely opaque and does not show such property thus it cannot be used to make a lens.

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Question 07

Which among the following are commonly used for making a safety pin?

(a) Wood and glass

(b) Plastic and glass

(d) Steel and plastic

Which of the following materials can be used to make a convex lens?

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