Question

Constants | Periodic Table Part A Two convex mirrors on the side of a van are shown in Figure 1). Estimate the ratio fupper/ fiower of the focal lengths of the mirrors. Assume that the image of the object in the upper mirror is approximately 3 times larger than that in the lower mirror, JupperJlower Submit Request Answer Figure 1 of 1 Provide Feedback Next >

Answer 1

Let object distance be u

Let image distance be v

As we know,

Magnification, M = image distance / object distance

                             = v/u

Since, object is at infinity, hence the image distance is equal to focal length

Magnification of upper mirror is three times the lower one.

=> M_upper / M_lower = f_upper / f_lower = 3

=> f_upper / f_lower = 3