Question

Partner: Trace the left and right surfaces of the block, and make marks that will allow you to trace the diverging rays emerging from the right side of the block. Remove the block, and trace the diverging rays back into the block using dash lines as shown in Figure 9. The place where these rays cross (inside the Acrylic block) is the apparent depth of the block. Measure the apparent depth, d, and the thickness, t, of the block and record it on your datasheet. Have your parer repeat the same process. 1) Concave and Convex Lenses Include your actual tracings (similar to Figure 7) with this data sheet. 2) Lensmaker's Formula Include your actual tracing (similar to Figure 8) with this data sheet 5 Trial Focal Length (cm) Focal Length (cm) Trial You Partner Focal Length (cm) of "mirror" Concave Lens Convex Lens em Analysis (8 pts): 1) Calculate the average for the focal lengths of the concave lens that you and your partner You Partner cm 3) Apparent Depth Include your actual tracing (similar to Figure 9) with this data sheet. Repeat the same for the convex lens. Finally, find fave, the average of the absolute values of these two focal lengths. 2) Calculate the radius of curvature of the concave lens using equation (8) of your lab manual 3) Using the lensmaker's formula (equation (5) of your lab manual), calculate the index of The lens is symmetric so the radii of curvature of the two sides have the same magnitude. Apparent depth d (cnm Trial Thickness t (cm) of block You Partner refraction of the acrylic lens. You should use the fave you calculated in part (1) above instead of the value for the focal length of the concave lens that you measured. Remember that the focal length of a concave lens is negative so in this case, f =-fave . Use Figure 1 for the sign convention. From your data, first calculate the average values of d and t and from these values, calculate the index of refraction of acrylic using equation (9). 4) Data Sheet O-2 69 Experiment 0-2

Answer 1

Concave Lens fant =-62cm Absolute Value of favg-62cm Convex Lens y portner 12.212.1m Absolute Value of favg-12.15㎝ 2) Radius of Curvature 2f Concave Lens mon+12.4cm (Lens is symmetric) Convex LenS Rces-24.30cm (Lens is symmetric) Lens Maer's formula R R2 Where f is the focal length, n is the index of refraction, R, &R, are the radii of curvature.of two sides Here -6.2 =(n-')(-12.4 12.4 -6.2 -6.2 or the index of refraction, n = 2 4) Real Depth Apparant Depth you +partne 1.44cm+145 1445cm Real Depth, lwvg Apparent Depth, d e1.7cm+1.6cm = 1.650cm 2

n=녹1.445=0.875 dax 1.650 aig