To find the focal length of a convex mirror , a student records the following data:
`{:("Object Pin","Convex Lens","Convex mirror","Image Pin"),(22.2 cm,32.2 cm,45.8 cm,71.2 cm):}`
The focal length of the convex lens is `f_(1)` and that of mirror is `f_(2)` . Then taking index correction to be negligibly small , `f_(1)` and `f_(2)` are close to :

Options

A. `f_(1) = 7.8 cm " " f_(2) = 12.7 cm`
B. `f_(1) = 15.6 cm " " f_(2) = 25.6 cm`
C. `f_(1) = 12.7 cm " " f_(2) = 7.8 cm`
D. `f_(1) = 7.8cm " " f_(2) = 25.4 cm`

Answer

A