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Dioptre power of an concave lens of 10 cm focal length is_______________?

/ Optical Instruments, Physics Mcqs / By
Dioptre power of an concave lens of 10 cm focal length is_______________?

A. 10 dioptre
B. 10 dioptre
C. 1 / 10 dioptre
D. 1 / 10 dioptre