CUET · PHYSICS · PYQ PAPER 2023
When monochromatic orange light is used instead of violet light in a convex lens, its focal length will :
- A increase
- B remains the same
- C first decreases then increases
- D decrease
Answer & Solution
Correct Answer
(A) increase
Step-by-step Solution
Detailed explanation
\(\mu_{violet} > \mu_{orange}\) From \(\frac{1}{f} = (\mu - 1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)\), \(f \propto \frac{1}{\mu - 1}\). Since \(\mu_{orange} f_{violet}\). increase
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