How are harmful rays produced from the sun during solar eclipse?
Your assertion is wrong. The sun does not produce any special rays during an eclipse. It is not even aware that a tiny little round ball called the moon going around a small planet like the earth is coming in the way of its light going to some parts of that planet. Even if it did know it would not care. It is true on the other hand that some people hurt their eyes badly while watching a total solar eclipse. The reason for that is the following. Sunlight during the middle of the day is too strong for eyes. If the pupil of the eye is fully open and we stare at the sun the heat can burn our retina. Ordinarily we never stare at the sun. The discomfort makes us turn our eyes away. In any case we automatically close the pupil of our eyes whenever the light is too bright. However while watching the solar eclipse we go through a phase when the sun is completely covered by the moon and we only see the beautiful corona around the sun. The corona is many orders of magnitude fainter than the disc
