A spoon in a glass of water appears bent. The speed of light increases as light goes from water into air so, it hits the water air boundary at an angle and light bends away from the normal. The human brain perceives light to travel in a straight line, so it will project these light rays backwards to a virtual light source behind the real spoon. A beam of light is both reflected and refracted when it strikes water. The tree is visible as a result of reflection, whereas the fish is visible due to refraction. In the summer time, these windows reflect some of the incident sunlight, which reduces air-conditioning costs. The reflection of clouds and the blue sky off these windows also makes them visually appealing: a) refraction takes place because light travels at different speeds in different mediums.
5) A light ray incident on a block of glass makes an incident angle of 50.0° with the normal to the surface. The refracted ray in the block makes a 26.8° with the normal. What is the index of refraction of the glass?
6)
A light ray traveling from a higher index of refraction medium into a lower index of refraction medium (for example, from water into the air) would bend away from the normal to the medium surface. When the refracted ray is parallel to the boundary of the medium, θ2= 90°. The incident angle, θ1, becomes θc, called the