Question

the numerical aperture of an optical fibre is 0.25 and refractive index of cladding is 1.5. find the critical angle at the core and cladding interface​

Answer 1

Explanation:

The mean of 10 Number is 28.if one is excluded their is 25. Find the excluded Number ?=−20

(a) v=−15

f

1

=

v

1

+

u

1

f

1

=−

15

1

−

20

1

f=−

7

60

cm

Focus is negative so mirror will be Concave mirror

(b) v=+15

Using the same formula:

f

1

=

15

1

−

20

1

f=60cm

Focus is positive, So mirror will be Convex mirror