Optics is one of the most important chapters of IIT-JEE physics. Once you understand the concepts even advanced problems will be easy to solve. Even though Modern physics is not important for JEE Advanced, its an easy way to score about 15-25 marks in JEE Main. You don't need to understand much in Modern physics - just formulas and other memory stuff.
About the book 'Understanding Physics for JEE Main and Advanced Optics and Modern physics':
Understanding Physics for JEE Main & Advanced Optics & Modern Physics is a comprehensive book for students preparing for various engineering entrance examinations. The book comprises of chapters on electromagnetic waves, reflection of light, refraction of light, interference and diffraction of light, and semiconductors. In addition, the book consists of several solved and unsolved multiple choice questions for thorough practice and revision.
Here I've posted the solutions for problems in 'Understanding Physics for JEE Main and Advanced Optics and Modern physics' by DC pandey.
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