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| 1. |
An object is placed 15cm away from a convex mirror of focal length 45 cm.calculate the position of image and its magnification |
| Answer» DISTANCE (U) = -15 CM ( Distance of object is always taken as negative) Focal length (f) = +45 cm ( Focal length of CONVEX mirror is taken as positive)Image distance (v) = ?➠ 1/45 = 1/-15 + 1/v➠ 1/45 + 1/15 = 1/v➠ 1/45 + 1×3/15×3 = 1/v➠ (1 + 3)/45 = 1/v➠ 4/45 = 1/v➠ v = 45/4 = 11.25 cmNow ➦ Image distance (v) = 11.25 cmWe know that, ➦ Magnification (m) = -v/uSo, we get➠ m = -11.25/15 ➠ m = -7.5 | |