Question

1. A doctor examines a mole with a 15.1 cm focal length magnifying glass held 11.4 cm from the mole How big is the image in millimeters if the mole is actually 4.2 mm in diameter?
2. What is the focal length of 2.4 D reading glasses found on the rack in a pharmacy?
3. How far, in centimeters from the lens must the film in a camera be, if the lens has a 36.3 mm focal length and is being used to photograph a flower 80.7 cm away?
4. A doctor examines a mole with a 13.3 cm focal length magnifying glass held 10.2 cm from the mole What's the magnification?
5. What is the power in diopters of a camera lens that has a 238.4 mm focal length?
6. You can determine the index of refraction of a substance by determining its critical angle. What is the index of refraction of a substance that has a critical angle of 61.7º when submerged in water (n = 1.333)?
7. At what minimum angle in degrees will you get total internal reflection of light when traveling from a medium of index of refraction of 1.56 to a medium with an index of refraction of 1.36.

Answer 1