COMEDK · Physics · 25. Ray Optics
One surface of a lens is convex and the other is concave. If the radii of curvatures are \(R\) and \(r\) respectively, the lens will be convex if
- A \(R > r\)
- B \(R=r\)
- C \(R < r\)
- D \(R=\dfrac{1}{r}\)
Answer & Solution
Correct Answer
(C) \(R < r\)
Step-by-step Solution
Detailed explanation
The lens maker formula is given by \(\dfrac{1}{f} = (\mu - 1) \left( \dfrac{1}{R_1} - \dfrac{1}{R_2} \right)\). For a lens with one convex surface and one concave surface, let the radius of the convex surface be \(R_1 = R\) and the radius of the concave surface be \(R_2 = r\).…
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