Menu
Books
NCERT: Text Format
Class 12 Books
Class 11 Books
Class 10 Books
Class 9 Books
Class 8 Books
Class 7 Books
Class 6 Books
Class 5 Books
Class 4 Books
Class 3 Books
Class 2 Books
Class 1 Books
Rationalised NCERT
Class 12 Books
Class 11 Books
Class 10 Books
Class 9 Books
Class 8 Books
Class 7 Books
Class 6 Books
Class 5 Books
Class 4 Books
Class 3 Books
Class 2 Books
Class 1 Books
Old NCERT (2015)
Class 12 PDFs
Class 11 PDFs
Class 10 PDFs
Class 9 PDFs
Class 8 PDFs
Class 7 PDFs
Class 6 PDFs
Class 5 PDFs
Class 4 PDFs
Class 3 PDFs
Class 2 PDFs
Class 1 PDFs
Lab Manuals & Kits
Learn
Classroom Courses
Class 10 Lectures
Class 9 Lectures
Class 8 Lectures
Class 7 Lectures
Class 6 Lectures
UPSC Exams
Civil Services Prelims
Teaching
Raj. 2nd Grade Teacher
Banking
Coming Soon
A-
A
A+
Define 1 dioptre.
One dioptre is equal to the reciprocal of the focal length measured in metres (that is, 1/metres).
41
