Physics · Grades 10–12
Image-size magnification
This question asks for size, not orientation; the magnification magnitude is given.
Rule and assumptions
This question asks for size, not orientation; the magnification magnitude is given.
|hi| = |m| × |ho|
Worked examples
An optical image has magnification magnitude 4.2. The object height is 22 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.
|hi| = |m| × |ho| 22 × 4.2 = 92.4
92.4 mm
An optical image has magnification magnitude 3. The object height is 53 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.
|hi| = |m| × |ho| 53 × 3 = 159
159 mm
Try two questions
An optical image has magnification magnitude 4.2. The object height is 3 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.
An optical image has magnification magnitude 1.2. The object height is 58 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.
Answers and reasoning
Answers and marking notes
- 12.6 mm
|hi| = |m| × |ho| 3 × 4.2 = 12.6
- 69.6 mm
|hi| = |m| × |ho| 58 × 1.2 = 69.6
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · independent educational and translation review required. Suggested grades are not official curriculum alignment.