2 LAB 11- Index of refraction and lenses

PHYS 1570 – LAB 11 INDEX OF REFRACTION AND LENSES Name of Students 1. 2. 3. _____________________________________________________________________________________ PART 1 – Determina?on of the index of refrac?on of glasses and the speed of light in glasses Accuracy on n glass : : -9.21% Trial # θ i (degree) sin θ i θ r (degree) sin θ r n glass v glass (m/s) 1 70 0.939 31 0.515 1.82 1.64 2 65 0.906 33 0.545 1.29 2.32 3 63 0.891 34 0.559 1.26 2.37 4 68 0.927 32 0.529 1.32 2.27 5 70 0.939 38 0.616 1.24 2.41 6 71 0.946 31 0.515 1.35 2.22 Average Group Average 1.38 2.20 x 10^8 m/s your   average − reference   value reference   value × 100

PART 2 – Determina?on of the focal length of two lenses LENS 1 Accuracy on focal length for LENS 1: :__31.91% LENS 2 Accuracy on focal length for LENS 2: :______45.93% PART 3 – Telescope Op?onal SeparaQon between the two lenses:_______100__________ mm • Does the telescope magnify the image? Yes it does magnify the image Object distance p (mm) Image distance q (mm) Calculated MagnificaQon M Observed MagnificaQon M Focal length f (mm) 380 405 -1.07 196.05 361 470 -1.30 204.18 378 407 -1.08 195.98 388 393 -1.01 195.24 Average 197.86 your   average − reference   value reference   value × 100 Object distance p (mm) Image distance q (mm) Calculated MagnificaQon M Observed MagnificaQon M Focal length f (mm) 106 102 -0.96 51.98 151 81 -0.54 52.72 130 90 -0.69 53.18 158 82 -0.52 53.98 Average 52.97 your   average − reference   value reference   value × 100