#### Which of the following is NOT a type of lens? 1. [ ] Convex 2. [ ] Concave 3. [ ] Cylindrical 4. [x] Plano #### Which principle is used in optical fiber communication? 1. [ ] Snell's Law 2. [x] Total Internal Reflection 3. [ ] Diffraction 4. [ ] Dispersion #### Which type of mirror can produce both real and virtual images depending on the object's position? 1. [ ] Convex mirror 2. [ ] Plane mirror 3. [x] Concave mirror 4. [ ] Parabolic mirror #### If the critical angle for total internal reflection in a medium is 45 degrees, what is the refractive index of that medium? 1. [ ] 0.5 2. [ ] 1.0 3. [x] 1.4 4. [ ] 2.0 #### What is the relationship between the angle of incidence (θi) and the angle of refraction (θr) when light travels from a less dense to a denser medium? 1. [ ] θi < θr 2. [x] θi > θr 3. [ ] θi = θr 4. [ ] The relationship cannot be determined. #### In a double convex lens, if the object is placed beyond twice the focal length, where is the image formed? 1. [ ] Beyond the focal point 2. [x] Between the focal point and the lens 3. [ ] At the focal point 4. [ ] Inside the lens #### What happens to the wavelength of light as it passes from air (n = 1.00) into a medium with a higher refractive index? 1. [ ] Increases 2. [x] Decreases 3. [ ] Remains the same 4. [ ] Doubles #### Which of the following is true about the speed of light in a medium with a higher refractive index? 1. [ ] It is always faster than in a medium with a lower refractive index. 2. [x] It is always slower than in a medium with a lower refractive index. 3. [ ] It depends on the frequency of light. 4. [ ] It remains constant regardless of the refractive index.