The image of an object formed by a convex lens may be real or inverted, smaller or larger than the object. It would depend upon the distance of the object from the lens. However, the image of an object formed by a concave lens is always virtual, erect, and smaller in size than the object(1). To obtain an image of an object on a screen, we require a (a) convex lens (b) concave lens (c) concave lens of large focal length (d) concave lens of small focal length(II) Where should an object be placed in front of a concave lens to obtain a virtual image of the object? (a) infinity (b) Principal focus (c) very close to the lens (d) any distance from the lens(III). Where should an object be placed in front of a convex lens to obtain an image of the size of the object? (a) at focus F (b) At 2F (c) beyond 2F (d) None of these(IV). To obtain an image smaller than the size of the object, we may use a (a) convex lens only (b) concave only (c) either a convex lens or a concave lens (d) cannot say(V). Name the part of a lens through which a ray of light passes without suffering any deviation, (a) optical center (b) At F (c) At 2F (d) none of the above