Optics-Lenses- 1cm thick glass slide is perpendicularly set

[Giuliaa]

Optics-Lenses-- 1cm thick glass slide is perpendicularly set

I don't know how to do the question below. It doesn't say whether the whole system in in the air or in a more refractive "environment" (i.e. submerged in oil). It too doesn't say the exact position where the lens is set, and I think that the exact place influences the formation of the new image!
Am I wrong??
By the way, the answer is C.



A 1cm thick glass slide is perpendicularly set in an optic system, as shown in the picture
http://www.flickr.com/photos/80147355@N05/7177962339/sizes/m/in/photostream/
A monochromatic light is used to form the image.

What happens to the image when glass is set?
a) Nothing happens, the image doesn't move.
b) The new image is closer to the lens.
c) The new image is farther from the lens.
d) No image is formed.
e) Two real images are formed, and they're less than 1cm distant from each other.

 

[Yukoel]

Hello Giuliaa,
I assume the ray diagram given is in the problem text .Just for the sake of it I can fairly conclude that the medium used is rarer compared to the glass of the lens by the fact that it acts as converging.Anyway I stick to the assumption that the slab is more optically dense than the medium.I do not think that the problem is anyhow affected by the position of glass slab w.r.t. the lens (provided the slab isn't shifted to the object side or placed beyond the point where lens makes image of the object).By the diagram the question translates simply into asking whether the glass slab would shift converging rays towards or away from itself .Well the answer tells it all :)
Correct me if I am wrong.
regards
Yukoel