Answer the following questions : (a) The angle subtended at the eye by an object is equal to the angle subtended at the eye the virtual image produced by a magnifying glass. In what sense then does a magnifying glass provided angular magnification ? (b) In viewing through a magnifying glass, one usually positions one's eye very close to the lens. Does angular magnification change if the eye is moved back ? ( c) Magnifying power of a simple a convex lens of smaller and smaller focal length and achieving greater and greater magnifying power ? (d) Why must both the objective and eye piece of a compound microscope have a short focal lengths ? (e) when viewing through a compound microscope, our eyes should be positioned not on the eye piece, but a short distance away from it for best veiwing, why ? How much should be that short distance betweenthe eye and eye piece ?