1) Does a diverging lens ( f <0, negative power) always form a virtual image? a)

Question

1) Does a diverging lens (f <0, negative power) always form a virtual image?
a) No. A diverging lens can form a real image if the object is further away from the lens than the near (front) focal point.
b) No. A diverging lens can form a real image if the object is closer to the lens than the near (front) focal point.
c) No. A diverging lens can form a real image if the object is infinitely far away.
d) Yes

2) Which of the following is true for the ray model of light? (Advanced comment: assuming a homogeneous index of refraction.)
a) Light rays travel in straight lines
b) Light rays can cross
c) A light ray travels forever unless it interacts with matter.
d) All of the above

Explanation / Answer

1)
d) Yes.
Only a converging lens or a concave mirror can produce real images.

2)
d) All the above is the correct answer.
These need not to be true for non-homogeneous index of refraction

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