The subscripts o and I are

Question 1

The subscripts o and I are used to denote quantities related to the object and image.

1. True
2. False

Question 2

The variables ho and hi are used to indicate the size (or height) of the object and image, respectively, in a ray diagram. A positive value is used when an object or image tip lies above the optic axis and a negative value is used when it is below.

 The image is said to be erect when ho and hi have opposite signs and inverted when ho and hi have the same signs.

1. True
2. False

Question 3 

The quantities di and do are measured from the focal point of a lens or mirror.

1. True
2.  False

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