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Grade 12th passZoology

A concave mirror of focal length f in air is immersed in water of refractive index of 4/3.the focal lenght of mirror in water will be.
a.f
b.4f/3
c.3f/4
d.7f/3

Profile image of Pushpa Raj Joshi
6 Years agoGrade 12th pass
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1 Answer

Profile image of Vikas TU
6 Years ago
Dear student 
For spherical mirror if R is radius of curvature, then focal length f=R/2.
Now, R is geometrical factor and it remains the same in air and liquid. So, f does not change.
Good luck 
cheers 

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