Question

 The maximum focal length of convex lens is for: 
 

• A. Blue light
• B. Green light
• C. Red light
• D. Yellow light

Hint:

Light with longer wavelengths, like red light, tends to have the largest focal length in a convex lens, due to its lesser refraction compared to shorter wavelengths.

Answer 1

The Correct Option is C

The focal length of a lens is dependent on the wavelength of the light passing through it. For a convex lens, the focal length is greatest for red light, as it has the longest wavelength.