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12 problems of increasing difficulty. P1: 'Convex lens f=10cm, u=-30cm. v=___cm' (15). P2: 'm=___' (-0.5). P3: 'Object 5cm tall. Image height=___cm' (-2.5, inverted). P4: 'Convex f=20cm, u=-25cm. v=___cm' (100). P5: 'm=___' (-4, magnified inverted). P6: 'Concave f=-15cm, u=-20cm. v=___cm' (-8.57). P
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