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I need help with those problems.please 7. When a 20 cm object is placed 30 cm from a concave mirror, it forms an inverted. real

I need help with those problems.please
7. When a 20 cm object is placed 30 cm from a concave mirror, it forms an inverted. real image 12 cm from the mirror. What is the mirror's focal length? 3. A divergent lens has a focal length of 6 cm. A 5 cm high object is placed 10 cm from the lens. Draw the ray diagram and calculate the magnication and the distance and height of the image

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