Bending the Path of Light and forming Images using a Single Thin Lenses

OPEM: Bending the Path of Light and forming Images using a Single Thin Lenses

Name: ________________________________________ Date: ________________________________________
Student Number: _______________________________

Table 1. ___________________________________________________________________________________________

Lens #1Quoted Lens power from manufacturer = _________________________Object Distance (So) [m]Image Distance (Si) [m]Focal length (f) (use eq. 2) [m]Determined value of the lens focal length = f=_________________________Calculated Dioptric Power of the Lens : = _______________________________

Lens #2Quoted Lens power from manufacturer = _________________________Object Distance (So) [m]Image Distance (Si) [m]Focal length (f) (use eq. 2) [m]Determined value of the lens focal length = f =_________________________Calculated Dioptric Power of the Lens : D =_______________________________Answer the following questions. Explain your arguments.1. An amateur astronomer has a telescope to examine distant stars and nebulae. The focal length of the main objective lens of the telescope is f= 710 mm. At what distance from the lens will a distant star be imaged using this objective lens? Give your answer in units of metres.2. The human eye has a nominal lens to retina distance of Si= 1.7 cm = 0.017 m . What does the focal length of the lens in the eye need to have if the Object to lens distance (So) is:a) So = 15 cm= 0.15 mb) So = 1mc) So = 15 md) So = 100000 km = 108 mThe human eye has an internal lens component that it can flex to change the effective cornea/ lens focal length. Using the results from parts a) through h) what is the percent change in focal length over the wide distances seen by the eye from very close to very far? Explain.3. A cell phone has a fixed focal length lens of f = 3.85 mm = 0.00385 m and can take pictures over a range of distances from So = 0.5 m to So = infinity. Over what range of distances (Si) does the lens in the cellphone have to move to focus an image at these two extremes in object distance?4. A microscope is being used to study cells on a slide. The lens to image distance is Si in the microscope is Si = 160 mm = 0.16 m. If a microscope objective of focal length f= 12.5 mm = 0.0125m is used, how far is the object to lens distance (So).3

 

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