Question

What is the value of 1n2 × 2n1?

Answer 1

1n2 * 2n1 = 1

Explanation:

2n1 denotes the refractive index of first medium with respect to second medium. 1n2 denotes refractive index of the second medium with respect to the first medium.

1n2 = n2/n1

2n1 = n1/n2

So 1n2 * 2n1 =  n2/n1 * n1/n2 = 1

Hence the answer is 1.

Answer 2

Answer:

1

​

n

2

=

n

1

​

n

2

​

​

and

2

​

n

1

​

=

n

2

​

n

1

​

​

Thus,

1

​

n

2

​

×

2

​

n

1

​

=

n

1

​

n

2

​

​

×

n

2

​

n

1

​

​

=1

Hence, the answer is 1.

Explanation: