Physics - Optics - Lenses - Convex and concave lenses - Lens Problems

10 problems. P1: 'A convex lens f=20cm. Object at 60cm. 1/v = 1/f + 1/u (with sign convention): v = ___ cm' (30). P2: 'Magnification = v/u = ___' (0.5). P3: 'Image is ___ (real/virtual), ___ (upright/inverted), ___ (magnified/diminished)' (real, inverted, diminished). P4: 'Object at 10cm from convex