top of page
  • Writer's picturekeshprad

PhysicsBowl 2018 Q19

19) This question asks us to identify the lens situation where an enlarged but inverted image of an object can appear. Right off the bat, when then question says that the resultant image is inverted, we can tell that we cannot use a diverging lens.

Where red represents the object, green represents the resultant image, orange represents the ray path, and f is the focal point

A diverging lens will always produce a smaller, upright image. This lets us eliminate choices C and D.


Next, we can take a look at ray diagrams for converging lenses.

Where red represents the object, green represents the resultant image, orange represents the ray path, and f is the focal point

When we place the object in front of a converging lens between its focal length and its radius, an inverted, enlarged image will appear. This is the resultant image we were looking for, so choice A is correct.


When the object is placed in front a converging lens' focal length, it will result in a virtual image. Although the image is enlarged, it is not inverted, so choice B cannot be correct.


Answer: A

Comments


bottom of page