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http://www.askiitians.com/iit-jee-ray-optics/thin-lens/ above link is the link to one of the pages of this site there is a question at the bottom of the page where it is mentioned that radius of curvature is R for large lens and R/2 for the smaller but i cant understand how and also how the refractive index of air is 1 here?

http://www.askiitians.com/iit-jee-ray-optics/thin-lens/

above link is the link to one of the pages of this site there is a question at the bottom of the page where it is mentioned that radius of curvature is R for large lens and R/2 for the smaller but i cant understand how and also how the refractive index of air is 1 here?

Grade:12th Pass

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