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part 1: A lens is held horizontally to form an image of an object on the...

part 1: A lens is held horizontally to form an image of an object on the ground. You observe that the image is formed above the lens. is the image virtual, inverted, or concave lens?

part 2: Two two-slit experiments are done separately in two mediums to study the effect that medium has on the interference. Each medium has the different indices of refraction, m and n, where m > n. In which medium are the interference fringes closer, if at all? is it m, n, fringes have the same distance or none?

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