Solve this:
Q.3. A biconvex lens ( μ = 1.5) of focal length 0.2 m acts as a divergent lens of power 1 D when immersed in liquid. Find the refractive index of the liquid.
 

Dear Student,
                         Means now its focal length is f'=11D=1mearliar it was f=.2mso we have  1f=n-11R1+1R2 for biconvex lens hence for two cases f'f=n-1n'-1according to question 1.2=1.5-1n'-1n'-1=.01n'=1.01
Regards

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