JAMB - Physics (2014 - No. 25)
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
2.7m
2.0m
2.3m
2.5m
คำอธิบาย
\(\frac{1}{U} + \frac{1}{V} = \frac{1}{f}\)
\(\frac{1}{8} + \frac{1}{V} = \frac{1}{2}\)
\(V = \frac{8}{3}\)
\(V = 2.7cm\)
\(\frac{1}{8} + \frac{1}{V} = \frac{1}{2}\)
\(V = \frac{8}{3}\)
\(V = 2.7cm\)