Aamc 9 #45

[tripkramer]

QUESTION: "The converging lens in Figure 1 is removed and the diverging lens is placed in position B, as shown in the figure below. Which of the following best describes the light rays from the diverging lens in this configuration?"

ANSWER: (D) Diverging lens, because "each light ray will refract at each surface of the lens and will increasingly diverge from the others because of the shape of each surface, so only diverging rays can result.

I understand that only diverging rays can result with diverging lens but why are the rays refracted and not reflected? I chose (C) Reflected rays diverging. Don't diverging lens always produce virtual images, which in lenses are at the same side of the object and therefore the ray would be sent back (reflected)?

I know there is no image attached but I don't think it is necessary - it seems to be just asking about diverging lens in general.

Thanks.

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[EmergentCough]

QUESTION: "The converging lens in Figure 1 is removed and the diverging lens is placed in position B, as shown in the figure below. Which of the following best describes the light rays from the diverging lens in this configuration?"

ANSWER: (D) Diverging lens, because "each light ray will refract at each surface of the lens and will increasingly diverge from the others because of the shape of each surface, so only diverging rays can result.

I understand that only diverging rays can result with diverging lens but why are the rays refracted and not reflected? I chose (C) Reflected rays diverging. Don't diverging lens always produce virtual images, which in lenses are at the same side of the object and therefore the ray would be sent back (reflected)?

I know there is no image attached but I don't think it is necessary - it seems to be just asking about diverging lens in general.

Thanks.

I hope you have figured this out by now, but if not...

You understand the concept of diverging, but I think you are mistaken on the difference between reflecting and refracting. Refracting is once it is through the lens it is in a different direction that when entered. Reflection would be coming back to the same side, or the back side of the refraction vector. Though this there isnt a picture attached, I can assume that the object is on the opposite side of the lens from the light source. You are correct, they only make virtual images, but your explanation is backwards. This is probably why you got it wrong. You were close though! (FYI This would be a virtual image. )