AP EAMCET · PHYSICS · Ray Optics
A screen is placed \(100 \mathrm{~cm}\) from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by \(20 \mathrm{~cm}\). The focal length of the lens is
- A \(18 \mathrm{~cm}\)
- B \(24 \mathrm{~cm}\)
- C \(25 \mathrm{~cm}\)
- D \(30 \mathrm{~cm}\)
Answer & Solution
Correct Answer
(B) \(24 \mathrm{~cm}\)
Step-by-step Solution
Detailed explanation
Given, distance between screen and object, \(d=100 \mathrm{~cm}\) Separation between the two pośitions of convex lens, \(\quad x=20 \mathrm{~cm}\) focal length of the lens, \(f=\frac{d^2-x^2}{4 d}\)…
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