knowlEDGE has no EDGE!

what is DIFFRACTION?
ANS: when we place any obstacle (any object) in the path of light,  the light rays bend around the edges of that obstacle.when we look at the image of that particular object  on the wall, the cenral portion of the image is darker than at  the edges of the image.this effect is due to a phenomenon called DIFFRACTION.

examples:   ^sunlight rays around the edges of clouds or mountains will  glow attractively.

                    ^ during solar eclipse it was adviced not to see sun rays directly.actually during solar eclipse the moon, which is in between sun and earth, crosses the sun obstruct the light rays . now the rays bend around the edges of the moon. this diffracting effect cause the intensity of light to be  more due to which light rays heap up at the moon's edges. the light rays, from the moon  during eclipse, are closer to earth when compared to those from sun.if anyone looked at this light, it will damage the eyes of humans.