
In the diagram given below, there are three lenses formed. Considering negligible thickness of each of them as compared to \( R_1 \) and \( R_2 \), i.e., the radii of curvature for upper and lower surfaces of the glass lens, the power of the combination is:
Which of the following is a sedimentary rock?
Mantri Mandir -- Where is it located?
Count the no of surfaces