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 light to pass through it. Since clay does not show such property, it cannot be used to make a lens.
Which of the following materials can be used to make a convex lens?
Question 07
Which among the following are commonly used for making a safety pin?
(a) Wood and glass
(b) Plastic and glass
(c) Leather and plastic
(d) Steel and plastic