- #1

radish

- 3

- 0

- Homework Statement
- I had a homework where a concave mirror with a focal point of -4 centimeters had an object away from it by 5 centimeters (1 cm after the focal point). I decided to solve the problem by drawing it this time and not by using the equations and its giving me a different answer than the equations.

- Relevant Equations
- 1/f=1/Di+1/Do

f= focal point

Di= distance of image

Do= distance of object

1/f = 1/Di + 1/Do

1/Di = 1/f - 1/Do

1/Di = 1/4 - 1/5

1/Di = 1/20

Di = 20 cm

In my drawing i had a focal point of 4 so a center of circumference of 8 and I had an object with a height of 1 cm placed 1 cm after the focal point, so 5 cm, away from the mirror. The distance of the image that i could measure was about 17.3 cm. Am i doing anything wrong?

1/Di = 1/f - 1/Do

1/Di = 1/4 - 1/5

1/Di = 1/20

Di = 20 cm

In my drawing i had a focal point of 4 so a center of circumference of 8 and I had an object with a height of 1 cm placed 1 cm after the focal point, so 5 cm, away from the mirror. The distance of the image that i could measure was about 17.3 cm. Am i doing anything wrong?