- #1

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## Homework Statement

## Homework Equations

## The Attempt at a Solution

I was kind of confuse with the use of refractive index.

For the first part of question, n

_{1}= 1.00 and n

_{2}= 1.50. From what I know, the object is at vacuum so the n

_{1}= 1.00.

But why for the second part of the question, n

_{1}= 1.50 and n

_{2}= 1.00 ? After the first refracting surface, the image should be at the vacuum too. But why we use n

_{1}= 1.50?