The drawing shows a cube. The dashed lines in the drawing ar…

The drawing shows a cube. The dashed lines in the drawing are perpendicular to faces 1, 2, and 3 of the cube. Magnetic fields are oriented with respect to these faces as shown, and each of the three fields B→1{“version”:”1.1″,”math”:”B→1″}, B→2{“version”:”1.1″,”math”:”B→2″} and B→3{“version”:”1.1″,”math”:”B→3″} has the same magnitude. Note that B→2{“version”:”1.1″,”math”:”B→2″} is parallel to face 2 of the cube. Rank the magnetic fluxes that pass through the faces 1, 2, and 3 of the cube in decreasing order (largest first).

You are trying to photograph your dog sitting in your backya…

You are trying to photograph your dog sitting in your backyard, but a tall hedge is blocking the view. However, as the drawing shows, a plane mirror reflects light from the dog into your camera. For what distance must you set the focus of the camera lens to snap a sharp picture of the dog’s image?