Optical fibres are glass fibres coated with a thin layer of a material with lower refractive index.
A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (ii), (iii), (iv) and (v)
Answer:D
Optical fibres are glass fibres coated with a thin layer of a material with lower refractive index.
A. (i) and (ii) B. (ii) and (iii) C. (iii) and (iv) D. (ii), (iii), (iv) and (v)