Answer:
40 D Given, d = 25 cm, m = 10 Angular magnification, \[m=\frac{d}{f}\] \[\therefore \] \[f=\frac{d}{m}=\frac{25}{10}=2.5\,\,\text{cm}\] But \[P=\frac{1}{f}\] So, \[P=\frac{100}{2.5}=+\,\,40\,\,\text{D}\]
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