Exercises Review of basic optics-Lenses (a) Consider a convex glass lens where the radius of the front surface is 25. of the back surface is 40 cm. Assume that the index of refraction is 1.5 length of the lens" Repeat the calculation assuming the lens is concave. (b) Consider a plano-convex lens, where the radius of the back surface is 50 the index of refraction is 1.5. What is the focal length of the lens? Rep assuming the lens is plano-concave. (c) Consider a meniscus convex glass lens where the radius of the front sur the radius of the back surface is -40 cm. Assume that the index of refra 1.11 The following are simple reviaw lens problems is the focal length of the lens? (d) Consider a meniscus concave glass lens where the radius of the front sur the radius of the back surface is -30 cm. Assume that the index of refra is the focal length of the lens? (e) Consider a convex lens with a focal length of 50 cm. If a point source i front of the lens. where is the image located? If the point source is move cm from the front of the lens, where is the image now located? () Consider a concave lens with a focal length of -50 cm. If a point soure in fro 15 cm from the front of the lens, where is the image now located? of the lens, where is the image located If the point source is r Review of basic optics-Telescope problems 1.12 Consider a telescope similar to Figure A.4. Assume thar the front lens is c lengih of 50 cm. Assume the back lens is convex with a focal lengtho that the lenses are separated by I meter and that the image is located a from the front of first lens. Calculate the location of the object. Is thi object? 1.13 Consider a telescope similar to Figure A.5. Assume that the front lens is c length of -20 cm. Assume the back lens is convex with a focal length ( that the lenses are separated by 70 cm and that the image is located a from the front of first lens. Calculate the location of the object. is th object? 1.14 Consider a telescope similar to Figure A.4. Assume that the front lens is c length of 40 cm. Assume the back lens is convex with a focal length of { input besm is collimated. (a) Plot the location of the focus spot as the distance separating the lenses 250 cm. (b) Discuss the plot in terms of the laboratory construction of a small teles beam expander. 1,15 Consider a telescope similar to Figure A.5. Assume that the front lens is c length of-30 cm. Assume the back lens is convex with a focal length of 1 input beam is collimated. (a) Plot the location of the focus spot as the distance separating the lenses 250 cm. (b) Discuss the graph in terms of laboratory construction of a snall telesc beam expander.