# 1. What magnification will be produced by a lens of power 3.30 D (such as might be...

## Question:

1. What magnification will be produced by a lens of power 3.30 D (such as might be used to correct myopia) if an object is held 30.0 cm away?

2.

a. A book held 7.50 cm from a magnifiying lens of focal length f = 11.0 cm. Find the magnification for the book.

b. Do the same for when the book is held 8.50 cm from the magnifier.

c. Do the same for when the book is held 9.50 cm from the magnifier.

3.

a. Suppose a 210 mm focal length telephoto lens is being used to photograph mountains 10.0 km away. Where is the image?

b. What is the height of the image of a 1100 m high cliff on one of the mountains?

4. A camera with a 80 mm focal length lens is used to photograph the sun and moon. What is the height of the image of the sun on the film, given the sun is 1.40×10^{6} km in diameter and is 1.50×10^{8} km away?

5. What is the focal length of a makeup mirror that has a power of 2.30 D?

6. Some telephoto cameras use a mirror rather than a lens. What radius of curvature mirror is needed to replace a 900 mm focal length telephoto lens?

7.

a. Calculate the focal length of the mirror formed by the shiny back of a spoon that has a 3.90 cm radius of curvature.

b. What is its power in diopters?

**Related Book For**