REFRACTION OF LIGHT THROUGH A GLASS PRISM   A glass prism is a five-sided solid with a triangular cross-section. It has two parallel, triangular faces and three rectangular faces that are inclined to each other at some suitable angle, which is called the angle of prism. In the given fig. ABC is a glass prism…

DEFECTS OF VISION AND THEIR CORRECTIONS The ability to see is called vision. Sometimes the eye may gradually lose its power of accommodation. As a result, the eye of a person cannot focus the image of an object on the retina properly. In such cases, the vision of a person becomes blurred. As a result,…