Xiaoming goes to the optical shop to get glasses. Our visual meter requires that the distance between the eyes and the eye chart is five meters.

The plane mirror of (1) is a virtual image.

(2) As shown:

The distance between the eye chart and the mirror is 2.7m, and the sum of the distances between the visual image and the mirror is 2.7m, that is, the distance between the eye chart and its image is 5.4m,

And because the distance between people and the eye chart should be 5m, the distance between people and the eye chart behind them should be 5.4m-5m = 0.4m 。

So, the answer is: virtual; 0.4 m

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