Calculate the numerical aperture of an optical fibre whose core and cladding are made of materials of refractive index 1.6 and

Calculate the numerical aperture of an optical fibre whose core and cl

1.	Calculate the numerical aperture of an optical fibre whose core and cladding are made of materials of refractive index 1.6 and
A.	0.55677
B.	55.77
C.	0.2458
D.	0.647852
Answer» B. 55.77