Which of the following statements for single optic devices are true? Choose all that apply. All converging optics have a

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Which of the following statements for single opticdevices are true? Choose all that apply.
All converging optics have a negative focal length.
For virtual images, the object distance is positive and theimage distance is positive.
By convention, if the image height is positive then the image isupright.
A magnification of -6 means the image is magnified.
It turns out that virtual images can be created by concavemirrors.
An image with a magnification of 2 is a virtual image.