COMEDK · Physics · 25. Ray Optics
When a biconvex lens of glass of refractive index 1.5 is dipped in a liquid, it acts like a plane sheet of paper.
This means the refractive index of the liquid is
- A Less than that of glass
- B Less than one
- C Greater than that of glass
- D Equal to that of glass
Answer & Solution
Correct Answer
(D) Equal to that of glass
Step-by-step Solution
Detailed explanation
The lens maker formula is given by \(\dfrac{1}{f} = (\mu_{rel} - 1) \left( \dfrac{1}{R_1} - \dfrac{1}{R_2} \right)\), where \(\mu_{rel} = \dfrac{\mu_{lens}}{\mu_{liquid}}\). When the lens acts like a plane sheet of paper, its focal length \(f\) becomes infinite, which implies…
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