Physics · Ray Optics
A concave mirror forms a real image on a screen that is three times the size of the object. The object and screen are then moved until the image formed on the screen becomes six times the size of the object. If the shift of the screen is 39 cm, what is the focal length of the mirror?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 139 cm
- 226 cm
- 310 cm
- 413 cm✓
Correct answer
13 cm
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