Geometric Optics

PHYS 2426 Engineering Physics II Problem 34.9 1. In the lab on thin lenses, you used a converging lens of focal length f1 = 10.0 cm to help you measure the focal length of a diverging lens. You placed the object at a distance d. = 30.0 cm to the left of the converging lens which formed an intermediate image at distance di. Then you placed the diverging lens 9.0 cm to the right of the converging lens. The final image is formed on a screen located a distance d'; = 10.4 cm to the right of the diverging lens. (a) Calculate the image distance di. (b) Calculate the focal length of the diverging lens. (c) Calculate the magnification of the two lens system.PHYS 2426 Engineering Physics 11 Problem 34.10 1. Images formed by our eyes are real inverted images formed on the retina which is located in the back of the eye a distance (approximately) 2.00 cm behind the Cornea. lmages formed by eye glasses and contact lenses are virtual upright images (formed in front of us) at locations best suited for the eye to see them clearly. The bottom part of bifocals is used for reading and seeingother nearby objects. This part of the glasses is a converging lens which takes objects located at 25.0 cm and forms images located at 37.0 cm. The top part is a diverging lens used for seeing far away objects. It takes a tree which is located 100 m away and forms an image at 7.0 m away. (a) The 37 .0 cm is called the near point of the eye. Calculate the focal length of the lower part of the glasses. Does your answer agree with the statement of the _ problem? (b) The 7.0 In is called the far point of the eye. Calculate the focal length of the top part of the glasses. Does your answer agree with the statement of the