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Grade 11Wave Optics

A convergent lens has a focal length of 20 cm and is made of a material of refractive index 1.1 is immersed in water. The lens will behave as a:
1. Converging lens of f=20 cm
2. Converging lens of f
3. Converging lens of f>20 cm
4. Divergent lens(Correct answer)
Pls answer in a basic manner
Thanks in advance

Profile image of Lakshmi Warrier
7 Years agoGrade 11
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1 Answer

Profile image of Dj Rex 10
7 Years ago
The lens will act as a diverging lens. Since the refractive index of lens is lesses than that of water. So ray entering water from the lens will diverge away from the normal.
 

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