(1) Choose a glass plate instead of a flat mirror, which is convenient for determining the position of the image and comparing the size relationship of the object image.

(2) measure that distance relationship between the object image and the plane mirror with a scale, and compare the distance relationship between the object image and the plane mirror.

(3) Choose two identical candles to compare the size of objects.

(4) Remove the candle B at the back and put a light curtain at the position of the image. There is no image on the light screen, which means that the plane mirror has become a virtual image.

(5) When Xiaohong gradually moves the candle away from the glass plate, the size of the candle remains the same, and it is equal according to the size of the object image, so the size of the candle image remains the same.

The distance from the object image to the plane mirror is equal, so the candle is far from the plane mirror, and the candle image is also far from the plane mirror.

So the answer is: (1) It is convenient to study the position and size relationship between images and objects;

(2) that distance to the plane mirror;

(3) size;

(4) can't; Virtual;

(5) unchanged; Stay away.