Hello Aspirant,
I hope you are doing well.
You can download the chhaya physics book class 11th wbchse chapters:
http://www.collegest.in/product/chhaya-physics-class-xi-wbchse
https://localmt.in/book/chhaya-physics-class-11-by-doari-majumder-myti/
I hope this helps.
Good luck!
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