The image of an optical pin placed at the principal focus of a concave mirror will be formed

Assessment: WAEC SSCE - Physics - 2004 (Objective) Subject: Physics

Question 1 Report

The image of an optical pin placed at the principal focus of a concave mirror will be formed
Answer Details
When an object is placed at the principal focus of a concave mirror, the reflected rays will be parallel to each other. This happens because the light rays coming from the object get refracted by the mirror in such a way that they all converge at the principal focus of the mirror. Therefore, the image of the object will be formed at infinity. So, the correct option is "at infinity".
Read lesson note on Reflection Of Light At Plane And Curved Surfaces (JAMB)
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