Physics · Ray Optics and Optical Instruments
A convex lens forms a real image of an object with magnification m1. The lens is moved towards the object to obtain another real image of magnification m2. If the image distance increases by x in this process, the focal length of the lens is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1x (m2 - m1)
- 2xm2 - m1✓
- 3(m1m2) x
- 4(m2m1) x
Correct answer
xm2 - m1
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