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1) a combination of two lenses 80cm apart, with the first ones focal length 20cm and...

1) a combination of two lenses 80cm apart, with the first ones focal length 20cm and the second focal is 25cm. both are converging lenses. when a final image is formed 50cm at the back of the lense (distance is +), where is the object relative tot he first lense?

2) a real image is produced 9 cm away from a mirror when the object is placed 14 cm away from that mirror. if the object 20cm away from the mirror, where will the image be? 7.5cm, 4.4cm, 5.4cm, 6.5cm, which approximation is the closest?

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Answer #1

u= -28.63cm ( left to the first lens)

v=-7.5cm...(left to the mirror)

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