Students of class 12th are advised to do not study given units of Physics

 Syllabus of Physics has been reduced for this year due to covid-19. 

Suggest you to don't study these units of book.

Unit 3: चुंबकत्व एवं द्रव्य (Meganetism & Metter)

 Unit 6:किरण प्रकाशिकी एवं प्रकाशिक यंत्र (Ray optics and optical Instruments)

Unit 8: नाभिक (Nuclei)