एक एकल झिरी (single slit) पर प्रकाश के विवर्तन में, केंद्रीय उच्चिष्ट (central maximum) की तीव्रता का उसके किसी भी ओर स्थित प्रथम द्वितीयक उच्चिष्ट (first secondary maximum) की तीव्रता से अनुपात लगभग कितना होता है?

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.