An equiconvex lens of refractive index 1.5 and focal length 10 cm (in air) is placed on the surface of water 
such that its lower surface is immersed in water but its upper surface is in contact with air outside. Principal axis is perpendicular to water. A beam parallel to its principal axis is incident on lens from air then -
Text Solution
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(a, c)
= 
⇒ f = R = 10 cm
= 
+ 
⇒ v = 20 cm
= 
⇒ f = 40 cm
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