4. A concave mirror is used to produce an inverted image of a light bulb directly
below the light bulb. The bulb is located 1.2 cm from the mirror.
a) What is the focal length of the mirror?
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image is directly below the object and (equal height) only when kept on centre
centre=1.2 cm
focal length=c/2
1.2/2
focal length=0.6 cm
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