Why are secondary Maxima not visible?

Secondary maxima in wave interference patterns are often not visible due to their reduced intensity compared to the primary maxima. This occurs because the constructive interference at secondary maxima is less pronounced, often resulting in destructive interference from nearby waves. Additionally, factors such as the wavelength of light, the spacing of slits in experiments, and environmental conditions can further diminish their visibility. As a result, the primary maxima dominate the observed pattern, overshadowing the secondary ones.