Which of the following quantities related to a lens depend on the wavelength or wavelengths of the incident light?
(Choose the incorrect option)

Options

A. a.power
B. b.focal length
C. c.chromatic aberration
D. d.radii of curvature

Answer

To solve the question, we need to analyze each of the options given and determine which quantity related to a lens does not depend on the wavelength of light.

### Step-by-Step Solution:

1. **Understanding Focal Length**:
- The focal length (F) of a lens is related to the refractive index (μ) of the lens material. The refractive index is known to vary with the wavelength of light (λ).
- The relationship can be expressed as:
\[ F \propto \frac{1}{\mu} \]
- Since μ depends on λ, it follows that the focal length also depends on the wavelength of light.

2. **Analyzing Power**:
- Power (P) of a lens is defined as the reciprocal of the focal length:
\[ P = \frac{1}{F} \]
- Since F depends on λ, it implies that power also depends on the wavelength of light. Thus, power is also affected by the wavelength.

3. **Chromatic Aberration**:
- Chromatic aberration occurs due to the variation of the refractive index with different wavelengths of light.
- Different wavelengths will focus at different points due to their varying speeds in the lens material, leading to color fringing.
- Therefore, chromatic aberration is also dependent on the wavelength of light.

4. **Radii of Curvature**:
- The radii of curvature (R) of the lens surfaces are physical dimensions and do not change with the wavelength of light.
- The radii of curvature are fixed properties of the lens and are independent of the light's wavelength.

5. **Conclusion**:
- From the analysis, we find that the quantities that depend on the wavelength of light are:
- Focal Length (F)
- Power (P)
- Chromatic Aberration
- The quantity that does not depend on the wavelength of light is the **Radii of Curvature**.

### Final Answer:
The incorrect option is **Radii of Curvature**.

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