Question

27. The normal is a line perpendicular to the reflecting surface at the point of incidence. 28. In the process of doing the refraction lab we find that ni-3,0,-470, eh-20° what is n2 29. In the process ofdoing the refraction lab we find that ni. 1.09, nr.8, 02-28° what is θί 30. A converging lens brings all icident light-rays parallel to its optic axis together at a point 31. The distance from the focal point to the optical center of the lens is called: 32. A 5cm tall object is placed 4cm in front of a converging lens that has a focal length of 8em. a. True b. False a. 0.145 b. 0.64 c. 0.413 d. 0.5 a. 20.15 b. 15.20 c. 18.30 d. 10.08 behind the lens, called the: a. Optical point b. Mid-point . Happy point d. Focal Point a. Dimension b. Focal length c. Focus d. Mid-point Where is the image located in a. -8 cm cm? b. -4 cm c. -5 cm d. -2 cm 33. What is the height of the image in question 32? 34. What is the magnification of the image in question 33? 35. Atoms of the same element with different number of neutrons are called a. 15 cm b. 5 cm c. 10 cm d. 2 cm a. 2 b. 10 c. 5 d. 15 a. Isotopes b. Copy Catsc. Ions d. Isomers 36. Half-life is the time a. For half of a material to decay into energy b. For half of a material to decay into free protons, neutrons, and electrons c. For half of a material to decay into a new material d. It takes to get out of school 37. What is the age of a sample if there are 6 grams of an element that have not decayed outof an original 24 grams and has a half-life of 8yrs a. 8yrs b. 50yrs c. 29yrs d. 16yrs

Answer 1

Using Snell's law n_1 sin theta_1 = n_2 sin theta_2 n_2 = n_1 sin theta_1/sin theta_2 = (0.3) sin 47 degree/sin 20 degree = 0.64 Using Snell's law n_1 sin theta_1 = n_2 sin theta_2 sin theta_1 = n_2 sin theta_2/n_1 theta_1 = sin^-1 (n_2 sin theta_2/n_1) = sin^-1 (0.8 sin 28 degree/1.09) = 20.15 degree Focal point