दो एकवर्णीय प्रकाश पुंजों की तीव्रताओं का अनुपात 1 : 9 है। यदि ये पुंज एक व्यतिकरण प्रतिरूप (interference pattern) उत्पन्न करते हैं, तो प्रतिरूप में अधिकतम तीव्रता का न्यूनतम तीव्रता से अनुपात क्या होगा?

In Young's double slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where the path difference is λ is K units. The intensity of light at a point where the path difference is λ3 will be:

Unpolarized light of intensity I0 = 40 W/m2 is incident on a polaroid. The transmitted light then passes through a second polaroid whose pass axis is inclined at 30° to the first. Find the intensity of light emerging from the second polaroid.