Becke Line use

 

Which is greater, n or N?

The film shows how a crystal with index N behaves, in an oil with index n, when the objective is displaced away from the preparation.

Note in which direction the Becke line moves as the objective is drawn away from the preparation, and this will be the medium with the higher index (in the next screen another example is given).

 EXAMPLE   ANSWER
   

What are the indices of these crystals?

Indicate whether:

- the two crystals' Ns are greater than the medium's n

- the two crystals' Ns are lower than the medium's n

-one crystal's N is greater and the other's is lower than the medium's n. Which is greater and which is smaller.

 displace objetive  answer
   

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