Rich M. answered • 04/14/20

Patient and Knowledgeable Math, Science, and Language Arts Tutor

1. What is the focal length of a mirror that has a radius of curvature of 0.09 m?

For a **Convex **mirror f = - R / 2 = - 0.045 m. For a **Concave **mirror f = + 0.045 m.

2. A converging lens has a focal length of 0.36 m. If an object is placed at 0.64 m from the lens, where will its image be located?

The lens formula is 1 / U + 1 / V = 1 / f where f is the lens focal length, u is the distance of the object to the lens and v is the image distance from the lens.

1 / 0.64 + 1 / V = 1/ 0.36

1 / V = 100 /36 - 100 / 64 = 2.78 - 1.55 = 1.22 = 1 / V

**v = 0.82 m to the right of the lens**

3. Is the image virtual or real in the previous question?

The image can be projected onto a screen. It is **inverted **and it is a **real image.**