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Solution


Q.

The following figure represents two biconvex lenses L1 and L2 having focal length 10 cm and 15 cm respectively. The distance between L1 and L2 is           [2024]
1 10 cm  
2 15 cm  
3 25 cm  
4 35 cm  

Ans.

(3)

D=f1+f2=25 cm, Paraxial parallel rays pass through focus and ray from focus of convex lens will become parallel.