Optics,how many images will the object form?

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The discussion centers on determining how many images a point object will form when placed in front of a lens made of two different materials. The relevant optical equation involves the focal length, refractive index, and the radii of curvature of the lens surfaces. Participants are exploring the relationship between these factors and the number of images produced, with options ranging from one to three images or no image at all. The inquiry also considers the scenario of using only the central part of the lens. Understanding the refractive index and focal length is crucial for solving the problem.
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optics,how many images will the object form?

Homework Statement



the lens shown in figure 19.16(http://img705.imageshack.us/img705/5066/figure1916.png made of two different materials . a point object is placed on the axis...how many images will the object form?

Homework Equations



1/f = (n-1) [1/R1 - 1/R2], where f is the focal length, n is the refractive index, R1,R2 - radii of the curvature of refracting surfaces.

The Attempt at a Solution



i didnt reach the answer but i think it has something with refractive index , and focal lenth...please help..
 
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ya forgot the choices

a)one

b)two

c)three

c)no image
 


If you just had the middle bit of the lens, would it form an image, more than one image, or none?
 

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