Enter the real distance (ft) and the refractive index into the Calculator. The calculator will evaluate the Apparent Distance.

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## Apparent Distance Formula

AD = RD / RI

Variables:

- AD is the Apparent Distance (ft)
- RD is the real distance (ft)
- RI is the refractive index

To calculate the Apparent Distance, divide the real distance by the refractive index.

## How to Calculate Apparent Distance?

The following steps outline how to calculate the Apparent Distance.

- First, determine the real distance (ft).
- Next, determine the refractive index.
- Next, gather the formula from above = AD = RD / RI.
- Finally, calculate the Apparent Distance.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

real distance (ft) = 4

refractive index = 1.234