CUET · PHYSICS · PYQ PAPER 2023
If in a plano-convex lens, the radius of the convex surface is 10 cm and the focal length is 30 cm. Then the refractive index of the material will be :
- A 1.33
- B 1.50
- C 1.66
- D 3.0
Answer & Solution
Correct Answer
(A) 1.33
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = (\mu - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( \frac{1}{30} = (\mu - 1) \left( \frac{1}{10} - \frac{1}{\infty} \right) \) \( \frac{1}{30} = (\mu - 1) \left( \frac{1}{10} \right) \) \( \frac{10}{30} = \mu - 1 \) \( \frac{1}{3} = \mu - 1 \)…
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