Huh, I took a test that said differently... weird
- Are you sure?Perfectly unpolarized light does lose half of its intensity when going through the first polarizer. According to Wikipedia, "A beam of unpolarized light can be thought of as containing a uniform mixture of linear polarizations at all possible angles. Since the average value of cos^2 is 1/2, the transmission coefficient becomes I/I_o=1/2"
- Next questionAn upright image is reduced to 1/4 of the object’s height when the object is placed 26.9 cm from the lens. What is the focal length of the lens
- answer the distance of the image is 26.9/4 = 6.725 cm Upright so it's virtual so distance is negative 1/f = 1/29.6 + 1/-6.725 = 1/29.6 - 4/29.6 = -3/29.6 So f = 29.6/-3 = - 9.86666... cm