How does focal length of a convex lens change with increase in wavelength of incident light?

Explanation

To determine how the focal length of a convex lens changes with an increase in the wavelength of incident light, we can follow these steps:

### Step 1: Understand the relationship between focal length and wavelength
The focal length \( f \) of a lens is related to the refractive index \( n \) of the lens material and the wavelength \( \lambda \) of the light passing through it. The refractive index is known to depend on the wavelength of light due to the phenomenon of dispersion.

### Step 2: Recall the lens maker's formula
The lens maker's formula is given by:
\[
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