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Given figures show the arrangements of two lenses. The radii of curvature of all the curved surfaces are same. The ratio of the equivalent focal length of combinations P, Q and R is ...... |
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Answer» <P>`2:2:1`  In given diagram P, Q and R lenses are in CONTACT. `therefore` For P COMBINATION of lenses, `(1)/(F_P)=1/f+1/f=2/f` `[because 1/F=(1)/(f_1)+(1)/(f_2)` for combination of lenses] or `F_P=f/2` Similarly for Q and R combination. `F_Q=f/2" and "F_R=f/2` Therefore, `F_P`: `F_Q`: `F_R` is equal to 1:1:1 |
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