# Optics Practice Problems

##### 1. Which of the following is the correct formula for focal point calculation?
1. F= I + O
2. 1/F = I x 1/O
3. F = 1 x 1/O
4. 1/F = 1/I + 1/O
##### 2. Which of the following is the correct formula for lens power (P)?
1. P = 1/f + 1/O
2. P = 1/f
3. P = f x O
4. P = O/f
1. 25 Degrees
2. 30 Degrees
3. 35 Degrees
4. 40 Degrees
##### 4. Which phenomenon can occur with light, but not with sound?
1. Doppler effect
2. Interference
3. Polarization
4. Refraction
1. -.125 m
2. -.25 m
3. 2.5 m
4. 2.75 m
##### 7. A spherical concave mirror is used in the back of a car headlight. Where must the bulb of the headlight be located to produce a parallel beam of reflected light?
1. Between the principal focus and the mirror
2. Beyond the center of curvature of the mirror
3. At the principal focus of the mirror
4. At the center of the curvature of the mirror
1. .08 m
2. .16 m
3. .24 m
4. .33 m
##### 9. A diverging (concave) lens can form images that are?
1. Virtual, only
2. Inverted, only
3. Either virtual or real
4. Either inverted or erect
1. 45 degrees
2. 60 degrees
3. 70 degrees
4. 80 degrees
1. Shorter
2. Longer
3. The Same
##### 12. What is the energy of a quantum of light having a frequency of 6.0 x 1014 hertz?
1. 1.6 x 10
2. 4.0 x 10
3. 1.3 x 10
4. 5.0 x 10-7 J
##### 13. Experiments performed with light indicate that light exhibits
1. Particle properties, only
2. Wave properties, only
3. Both particle and wave properties
4. Neither particle or wave properties
##### 14. What is the speed of light in a medium having an absolute index of refraction of 2.3?
1. .77 x 10
2. 1.3 x 10
3. 1.5 x 10
4. 2.3 x 108 m/s