Students form a more exact idea of the action of optical mirrors if they can observe the wave field being formed during reflection. For this purpose it is possible to organize model experiments with flexural waves propagating in thin elastic plates. The direct and round edges of the plates are used as models of plane, convex and concave mirrors. The wave source is a vertically located vibrator of a magnetostriction radiator. The wave field is visualized with light dry powder. In these experiments students determine the wavelength and the velocity of a flexural wave, measure the distance from a wave's source to the mirror model, calculate its radius of curvature and make sure that the formula of a mirror is correct.