Ray Optics and Optical Instruments - Result Question 39
40. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
[2003]
(a) remain unchanged
(b) become zero
(c) become infinite
(d) become small, but non-zero
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Answer:
Correct Answer: 40. (c)
Solution:
(c)
where,
