CUET · PHYSICS · PYQ PAPER 2023
A plano convex lens is made of material having refractive index 1.8. If the radius of curvature of the curved surface is 80 cm, then focal length of the lens is :
- A 100 cm
- B 50 cm
- C 180 cm
- D 144 cm
Answer & Solution
Correct Answer
(A) 100 cm
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = (\mu - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( \frac{1}{f} = (1.8 - 1) \left( \frac{1}{80 \text{ cm}} - \frac{1}{\infty} \right) \) \( \frac{1}{f} = (0.8) \left( \frac{1}{80 \text{ cm}} \right) \) \( f = \frac{80 \text{ cm}}{0.8} \)…
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