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Q)
The two surfaces of a concave lens, made of glass of refractive index
1.5
have the same radii of curvature R. It is now immersed in a medium of refractive index
1.75
then the lens,
(a) becomes a convergent lens of focal length
3.5
R
(b) becomes a convergent lens of focal length
3.0
R
(c) changes as a divergent lens of focal length
3.5
R
(d) changes as a divergent lens of focal length
3.0
R
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