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| 1. |
How far should an object be placed from a converging mirror of focal length 20 cm to form a real image of the size one fourth the size of the object? |
| Answer» VERGING mirror we know that MAGNIFICATION m=−v/u and real images FORMED by concave mirror are inverted so, −1/4=v/−u⇒v=u/4Using these in the mirror FORMULA : v1 + U1 = f1 u−4 + u−1 = 20−1 u5 = 201 This gives u=5×20=100cm | |