This is a revised edition textbook clearly illustrated by Modern Publishers and written by two amazing writers Ashok Sharma and Manohar Lal Kaushal for BSc 3rs semester Panjab University, Chandigarh. 

• the complete text has been revised to make the subject matter simple, clear, and interesting 
• a large number of well-labeled structures and diagrams are given for the proper understanding of the subject 
• a large number of questions and problems of recent examinations papers of H.P., P.U., Pbi.U., and G.N.D.U. have been included at the end of each chapter to make the students familiar with the nature of the questions to be asked at their examinations 

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• short answer type questions, long answers type questions, very short answer type questions, and lastly, multiple-choice questions with few hinted answers are added 
• important or probable questions slash statements or principles are boldly highlighted 
• few questions are graded that are asked in previous year University examinations

          *CONTENTS*

1.   Interference of Light

2.   Diffraction

3.   Polarization