It is refraction that makes some objects appear ... that is used to focus light. A convex lens is made from a transparent material that bulges outwards in the middle on both sides.

Find the Solved MCQs Practice Paper for CBSE Class 10th Physics Chapter ‘Light - Reflection and Refraction ... middle and bottom parts made of: (a) Convex, plane and concave mirrors respectively.

Refraction errors can also be identified using a refractor, which uses convex lenses to examine how the eye processes light.