A convex lens of glass (n = 1.5) has a f

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Target Exam

CUET

Subject

Physics

Chapter

Ray Optics

Question:

A convex lens of glass (n = 1.5) has a focal length 18 cm in air. When it is immersed in water (n = 4/3), the focal length increases to:

Options:

18 cm

36 cm

54 cm

72 cm

Correct Answer:

72 cm

Explanation:

The correct answer is Option (4) → 72 cm