Suppose a student sets up yet another mystery lens (“lens 7”) on the rail with the light source and a screen. With this lens placed a particular distance, p1, in front of the light source, a sharp, inverted image that is the same size as the original light source forms on the screen when the screen is located a distance, q1, in front of the lens. The student then adds a second, identical “lens 7” so that is is pressed up right against the first lens on the rail. In one to three sentences, describe (as accurately as possible) what you must do to obtain an image on the screen again with this new “combination” lens, and explain why.

Suppose a student sets up yet another mystery lens (“lens 7”) on the rail with the light source and a screen. With this lens placed a particular distance, p1, in front of the light source, a sharp, inverted image that is the same size as the original light source forms on the screen when the screen is located a distance, q1, in front of the lens. The student then adds a second, identical “lens 7” so that is is pressed up right against the first lens on the rail. In one to three sentences, describe (as accurately as possible) what you must do to obtain an image on the screen again with this new “combination” lens, and explain why.

Similar questions

An object measures 4cm high above the axis of an optical system consisting of a 2-cm aperture stop and a thin convex lens of 6-cm focal length and 5-cm aperture. The object is 14 cm in front of the lens and the stop is 2.50cm behind the lens. Determine the position and size of the entrance and exit pupils, as well as the image. Sketch the chief ray and the two extreme rays through the optical system, from the top of the object to its conjugate image point.
Your telescope has a 850-mm-focal-length objective and a 22 mm -focal-length eyepiece. One evening you decide to look at the full moon in (Figure 1), which has an angular size of 0.52 ∘ when viewed with the naked eye. What angle (in degrees) does the image of the moon subtend when you look at it through your telescope? Suppose you decide to take a photograph of the moon using your telescope. You position a CCD detector so that it captures the image produced by the objective lens. What is the diameter of that image?
If the screen is at the right position and the object is in a right position, the lens will focus the image of the object onto the screen. If the screen is anywhere else, the object will look blurry or won't be seen. The optical table has a meter-tape attached to the side, to give the position of the items. If the object is in a wrong position, the lens will defocus the light -- spread it out. That means that the screen can't be placed anywhere to display a focused image. If xL = 32.7 cm and the focal length is f = 20.8 cm, give a position (xO) that results in the light from the object spreading out. (There are infinitely many such positions.)
Two converging lenses with foci of f1=10 cm and f2=20 cm, respectively, are separated by 20 cm, as indicated in the figure. An object is placed 15 cm to the left of the first lens. Find analytically and graphically the position and magnification of the final image, as well as its final size, due to the combination of the two lenses. Indicate if the image is vertical, inverted, real or virtual.
Thin lenses. Object O stands on the central axis of a thin symmetric lens. For this situation, each problem in the table (below) gives object distance p (centimeters), the type of lens (C stands for converging and D for diverging), and then the distance (centimeters, without proper sign) between a focal point and the lens. Find (a) the image distance i and (b) the lateral magnification m of the object, including signs. Also, determine whether the image is (c) real or virtual, (d) inverted from object O or noninverted, and (e) on the same side of the lens as object O or on the opposite side. (a) (b) (c) (d) (e) Lens i m R/V I/NI Side +14 C, 24 (a) Number Units (b) Number i Units (c) (d) (e) > >
Your telescope has a 850-mmmm-focal-length objective and a 22 mmmm -focal-length eyepiece. One evening you decide to look at the full moon in (Figure 1), which has an angular size of 0.52 ∘ when viewed with the naked eye. What angle (in degrees) does the image of the moon subtend when you look at it through your telescope? Suppose you decide to take a photograph of the moon using your telescope. You position a CCD detector so that it captures the image produced by the objective lens. What is the diameter of that image?
In the figure, a sand grain is 3.2 cm from thin lens 1, on the central axis through the two symmetric lenses. The distance between focal point and lens is 4.0 cm for both lenses; the lenses are separated by 8.0 cm. (a) What is the distance between lens 2 and the image it produces of the sand grain? Is that image (b) to the left or right of lens 2, (c) real or virtual, and (d) inverted relative to the sand grain or not inverted? (a) Number (b) (c) (d) < < < Units te 1 2
- Your answer is partially correct. Figure (a) shows the basic structure of a camera. A lens can be moved forward or back to produce an image on film at the back of the camera. For a certain camera, with the distance i between the lens and the film set at f = 6.44 cm, parallel light rays from a very distant object O converge to a point image on the film, as shown. The object is now brought closer, to a distance of p = 220 cm, and the lens- film distance is adjusted so that an inverted real image forms on the film (Figure (b)). (a) What is the lens-film distance i now (in cm)? (b) By how much (in cm) was distance i changed? (a) Number i 6.26 (b) Number IN i 1.26 (a) Film- Units cm Units cm 1° トｶー (b)
A 5.0-cm tall object stands in front of a converging lens. It is desired that the virtual image is 2.5 times larger than the object be formed by the lens. How far from the lens must the object be placed to accomplish this task, if the final image is located 15 cm from the lens?