Which one of the following materials cannot be used to make a lens?
- Water
- Glass
- Plastic
- Clay
The Correct Option is D
Solution and Explanation
A lens allows light to pass through it. Since clay does not show such property, it cannot be used to make a lens.
So, the correct option is (D): Clay
Top Questions on Spherical Mirrors
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On the day of her examination, Riya sharpened her pencil from both ends as shown below.
The diameter of the cylindrical and conical part of the pencil is 4.2 mm. If the height of each conical part is 2.8 mm and the length of the entire pencil is 105.6 mm, find the total surface area of the pencil.- CBSE Class X - 2025
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Concepts Used:
Spherical Mirrors
A spherical mirror is a mirror which has been cut out of a spherical surface.
There are two kinds of spherical mirrors:
- Convex Mirror
- Concave Mirror
Concave Mirror
Concave mirrors are also called converging mirrors, because in these types of mirrors, light rays converge at a point after impact and reflect back from the reflective surface of the mirror.
Convex Mirror
The convex mirror has a reflective surface that is curved outward. Regardless of the distance between the subject and the mirrors, these mirrors are "always" virtual, upright and reduced.