2. Two identical concave mirrors are used as a mold to create a lens they are put together like a clam shell, and a transparent fluid is injected between them, which then hardens into a convex lens. The lens is removed, and an object is placed on the reflecting side of one of the mirrors. The image seen is real, and is distance d from the mirror. The object is left in place, while the mirror is replaced with the lens, through which the object is viewed. Once again an inverted image is seen, and the distance d from the lens to this image is the very same distance as before. Find the index of refraction of the lens.

2. Two identical concave mirrors are used as a mold to create a lens they are put together like a clam shell, and a transparent fluid is injected between them, which then hardens into a convex lens. The lens is removed, and an object is placed on the reflecting side of one of the mirrors. The image seen is real, and is distance d from the mirror. The object is left in place, while the mirror is replaced with the lens, through which the object is viewed. Once again an inverted image is seen, and the distance d from the lens to this image is the very same distance as before. Find the index of refraction of the lens.