An object of height 4.25 mm is placed at a distance 10 cm from a convex lens of power `+5`D. Find (i) focal length of the lens, and ii) size of the image.

Explanation

To solve the problem step by step, we will follow these steps:

### Step 1: Find the Focal Length of the Lens
Given the power of the lens (P) is +5 D (diopters), we can use the formula for power:
\[ P = \frac{1}{f} \]
where \( f \) is the focal length in meters. Rearranging the formula to find \( f \):
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