Two identical planoconvex - lenses touching each other at their spherical surface of radius R. If refractive index of lense is 1.50,then the lens behave
A
Convergent with power P=1R
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B
Convergent with power P=16R
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C
Divergent with power P=13R
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D
Divergent with power P=16R
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Solution
The correct option is A Convergent with power P=1R R1=RR2=−Rμ=1.5Using lens maker formula1f=(μ−1)(1R1−1R2)1f=(1.5−1)(1R−1−R)1f=(0.5)(1R+1R)1f=0.5×2R1f=1Rf=R
P=1R
Since, focal length is +Ve, hence lens are converging.