JEE Mains · Physics · STD 12 - 9. Ray optics and optical instruments
Light from a point source in air falls on a convex curved surface of radius \(20 \mathrm{~cm}\) and refractive index \(1.5.\) If the source is located at \(100 \mathrm{~cm}\) from the convex surface, the image will be formed at _______ \(\mathrm{cm}\) from the object.
- A \(100\)
- B \(200\)
- C \(300\)
- D \(400\)
Answer & Solution
Correct Answer
(B) \(200\)
Step-by-step Solution
Detailed explanation
\(\frac{\mu_2}{\mathrm{v}}-\frac{\mu_1}{\mathrm{u}}=\frac{\mu_2-\mu_1}{\mathrm{R}}\) \(\frac{1.5}{\mathrm{v}}-\frac{1}{-100}=\frac{1.5-1}{20}\) \(\mathrm{v}=100 \mathrm{~cm}\) Distance from object \(=100+100\) \(=200 \mathrm{~cm}\)
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