When an object is placed 10 cm in front ...

When an object is placed 10 cm in front of lens A, the image is real, inverted, magnified and formed at a great distance. When the same is placed 10 cm in front of lens B, formed is real, inverted and same size as the object.
a) What is the focal length of lens A?
b) What is the focal length of lens B?
c) What is the nature of lens A?
d) What is the nature of lens B?

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