4. A standard two-lens microscope consists of two converging lenses (both with v

Question

4. A standard two-lens microscope consists of two converging lenses (both with very short focal lengths), placed a distance L apart along a central optical axis, as shown (drawing not to scale) a. place eye right next to ..eyepiece (eye) (objective lens) (eyepiece) object (retina) fob (eye's lens) The object is placed close to but just outside the focal point of the objective lens. The eyepiece acts as a magnify ing glass, so the assumption is that you will use it as such (with comfortable viewing). Thus, you will place your naked eye right next to it, and its object (the objective lens' image) is located just inside its focal point. (i) Describe how this instrument works (no need for numbers here). Starting with the light coming from the original object, answer the following for each lens (including your eye's lens), in the order the light reaches ift: What is "the object" for this lens? Where is that "object" located:? Compared to the original object. Is this "object" larger or smaller? Is it upright or upside-down? Where is the resulting image located? Compared to the original object. Is this image larger or smaller? Is it upright or upside-down? Eyepiece What is "the object" for this lens? Where is that "object" located:? Compared to the original object. Is this "object" larger or smaller? Is it upright or upside-down? Where is the resulting image located? Compared to the original object. Is this image larger or smaller? Is it upright or upside-down? What is "the object" for this lens? Where is that "object" located:? Compared to the original object. Is this "object" larger or smaller? Is it upright or upside-down? Where is the resulting image located (no values here, just describe in general)? Compared to the original object. Is this image larger or smaller? Is it upright or upside-down? Page 17

Explanation / Answer

1. Objective lens

a. object for this lens is the object at infinity

b. this object is located at infinity

c. this is the original object hence its sie is the same as that of the original object

d. the object is upright

e. resulting image is located in the focal plane of the pbjective lens

f. compared to the original object the image is smaller and is inverted

2. Eyepiece

a. object for this lens is the image formed by the objective

b. the object is located at the focus of objective and just insude the focal length of the eyepiece

c. compared to the original object, this object is smaller and is inverted

d. the resulting image is located on the same side of the eyepiece

e. compared to the original object the final image is smaller and inverted

3. Eye's lens

a. object for this lens is the image formed by the eyepiece

b. this object is located on the other side of the eyepeiece when seen from the eye's perespective

c. compared to original object this image is smaller and erect

d. the resulting image is locvated at the retina of th eeye

e. compared to original object this image is smaller and erect

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