5. Light goes from medium A to medium B with an angle of incidence at 40o and the angle of refraction at 30o. How will you compare the speed of light in B with that in A?
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- 6. Explain why a person's legs appear very short when wading in a pool. Justify your explanation with a ray diagram showing the path of rays from the feet to the eye of an observer who is out of the water.11) Consider the internal reflection of light at the interface between water and ice. For convenience, the index of refraction for a variety of materials is provided below. a) What is the minimum angle, in degrees, at which you will get total internal reflection at this interface?1. Suppose the figure below represents a ray of light going from air through crown glass into water, such as going into a fish tank. Calculate the amount the ray is displaced by the glass (4x), given that the incident angle is 50° and the glass is 1.1 cm thick. The refractive index of glass is 1.52. Amount of ray displacement, Ax: 6 yax mm
- 3. A light ray of wavelength 589 nm (produced by a sodium lamp) traveling through air is incident on a smooth, flat slab of crown glass at an angle 0, of 30.0° to the normal, as shown in the Figure below. a. Find the angle of refraction, 02; b. At what angle 03 does the ray leave the glass as it re-enters the air?; c. How does the answer for 03 change if the ray enters water below the slab instead of the air? Incident Normal ray Refracted ray8. A light source is embedded in plastic (n = 1.30). When the light exits the plastic it enters air (n = 1.00). Show how to solve for the critical angle. DO NOT ATTEMPT TO GET A NUMERICAL ANSWER. (Friendly reminder: no calculator.)n₂ > 1₁, and finally passes into air. 18. Light starts in a medium of index of refraction n₁, passes into a medium of index 2 A. A B. B C. C D. D E. E n₂>n₁ n. A B C where air E
- 18. A beam of light passes from air into a transparent petroleum product, cyclohexane, at an incident angle of 48°. The angle of refraction is 31°. What is the index of refraction of the cyclohexane?A light ray moves from air to an optically denser glass where it travels at 1.95*108 m/s. By how much the ray will deviate from its 550 angle of incidence? a) 32.20 b) 22.80 c) 87.20 d) none of these.2. Light refracts from air (n =1.0) into an unknown substance. The angles of incidence and refraction are 0₁ = 42° and 82 = 18°, respectively. What is the index of refraction of the unknown substance? (3 pts.) 96
- There is a 1.2 m cube-shaped tank completely filled with water (n = 4/3). At sunset, what angle does the last ray of light make with respect to the horizontal? solar that stops illuminating the bottom of the tank? a) 90 ° b) 19.47 ° c) 0 ° d) 70.53 °1. What will be the relationship of the angle of incidence with the angle of reflection for light rays shining on a piece of paper with rough surface?3. A ray of light crosses from a flint glass slab at 20° from the normal into air. At what angle does it emerge?