Question

5. 1 is the identity for the addition of a rational number.

6. If a 

1

a

= 1, at 0 then a and

1

a

are the reciprocals of each other.

7. 25000 is a perfect square number.

8.

1 1 3 3

9 9

 

= 0​

Answer 1

Answer:

We here define refractive index, n, of a material or substance as the ratio of the speed of light in a vacuum, C, to the speed of light in a material through which it passes, Cm.

Answer 2

Step-by-step explanation:

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