A small rod is inclined at 45° to the principal axis. At its centre a concave mirror has transverse magnification -2. To first order, if the rod has equal axial and transverse components, the magnitude ratio of image axial component to image transverse component is:
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Question

A small rod is inclined at 45° to the principal axis. At its centre a concave mirror has transverse magnification -2. To first order, if the rod has equal axial and transverse components, the magnitude ratio of image axial component to image transverse component is:

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G1 Physics · Accepted Answer

Axial component scales by |m|²=4, transverse by |m|=2, so the ratio is 2.

A small rod is inclined at 45° to the principal axis. At its centre a concave mirror has transverse magnification −2. To first order, if the rod has equal axial and transverse components, the magnitude ratio of image axial component to image transverse component is: