Question

iridescent substance meaning​

Answer 1

Answer:

Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear to gradually change color as the angle of view or the angle of illumination changes.

Answer 2

Iridescence is a surface optical phenomenon in which the colour changes depending on the angle of observation and irradiation.

• Soap bubbles, feathers, butterfly wings, and seashell nacre etc. have iridescence naturally.
• It's frequently caused by structural colouring.
• Multiple reflections from two or more semi-transparent surfaces alter the incidental light due to phase shift and interference of the reflections.
• The interference pattern is determined by the thickness of the layers of the material.
• Diffraction can also cause iridescence.
• CDs, DVDs, some types of prisms, and cloud iridescence are examples of this.
• When diffraction occurs, the whole rainbow of colours is usually seen as the viewing angle fluctuates.
• Iridescence has evolved in several plant species as a means of implementing more light in dark conditions.  
• Selaginella, a lycophyte, and some fern species have iridescences based on multiple layers of cells.
• Colours created without the use of pigments or dyes are referred to as structural colouring in biological applications.