CUET · PHYSICS · PYQ PAPER 2023
3 A double convex lens made of glass of refractive index has both radii of curvature of magnitude 20 cm. An object 3 cm high is placed at 10 cm from the lens. What is the nature and size of the image ?
- A 3 cm; real and inverted
- B 6 cm; virtual and erect
- C 2 cm; virtual and erect
- D 2 cm; real and erect
Answer & Solution
Correct Answer
(B) 6 cm; virtual and erect
Step-by-step Solution
Detailed explanation
\( \frac{1}{f} = (n - 1) \left( \frac{1}{R_1} - \frac{1}{R_2} \right) \) \( \frac{1}{f} = (1.5 - 1) \left( \frac{1}{+20 \text{ cm}} - \frac{1}{-20 \text{ cm}} \right) = 0.5 \left( \frac{2}{20 \text{ cm}} \right) = \frac{1}{20 \text{ cm}} \) \( f = +20 \text{ cm} \)…
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