1) A mirror creates an image that has a height of 1.30 cm that is behind the mirror and 189 cm from the object.The image was created from a 2.60 cm tall object. What is the focal length of the mirror?
2) A lens placed 12.0 cm in front of an object creates an upright image 3.00 times the height of the object. The lens is then moved along the optical axis until it creates an inverted image 3.00 times the height of the object. How far did the lens move?
(I have been trying to figure these two out for a while, can someone please help me?)
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