A concave, spherical mirror and a thin, converging lens are both measured in air (51:1.0) to have the same focal length, f. Both the mirror and the lens are then placed under water {n='l.33) and their focal lengths are measured again. For both the mirror and the lens state whether its focal length underwater will be the same, longer or shorter than f. and in both cases give a reason for your answer. Atvpe of "meniscus" lens is shown in the figure. The front face has a magnitude ofthe radius of curvature, R1 :29 cm and the rear face has a R magnitude of a radius of curvature, R2 :69 cm. The refractive index ofthe glass, n=1.8. If an object is placed at a distance, u=16 cm to the left of 1 the lens, where will the resulting image be located? Specify the image distance from the lens with a sign that indicates which side of the lens the image is formed: negative for the same side as the object. positive forthe opposite side. Object Answer: Choose\". Check An object of height h = 14 cm is placed on the optical axis at a distance of 21 = 15 cm from lens 'I as shown in the diagram. The distance separating the two lenses is 188 cm. The magnitudes of the focal lengths of the two lenses are |f1| = 10 cm and |f2| = 40 cm . respectively. What is the apparent height |h'| ofthe resulting image? 1 2 Answer: C hoose... v Check Refer to the previous question about the size of the image. Drag the correct words into the blanks to create a correct statement below. The final image produced by the two-lens system is a |:| image which is Cl and on the D side of lens 2 compared to the o_rig object. Note: You onlyr get one attempt at this question because there are onlyr two options for each blank! virtual inverted upright same W opposite] \fAn object is placed on the optical axis at a distance of $1 = 40 cm from lens 1 as shown in the diagram. The distance separating the two lenses is 23 cm. The focal lengths for the two lenses are f1 = 20 cm and f2 = 2? cm. respectively. Where is the final image located? Specif).r the image distance for the final lens {lens 2). 1 2 Answer: C hoose... Check The objective aperture of a retracting telescope has a diameter of 80 mm. The angular magnication ofthe telescope is 40. What minimum diameter of eyepiece is required to called all the light entering the objective lens from a distant point source on the telescope axis? Note: Objective aperture diameter 2 diameter of objective lens. Answer: Ch DOSE.\" Check