MHT CET · Physics · Experimental Physics
Focal length of a convex lens will be maximum for
- A yellow light.
- B violet light.
- C blue light.
- D red light.
Answer & Solution
Correct Answer
(D) red light.
Step-by-step Solution
Detailed explanation
Red light has the lowest refractive index for a given lens material. Since \( \frac{1}{f} = (n-1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \), a lower \(n\) results in a larger \(f\).
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