Question

10000 words about refraction of light

Answer 1

- Refraction of Light Aim: To find a relationship between the angles of incidence and the angles of refraction by obtaining a set of readings for the angles of incidence and refraction as a light ray passes from air into perspex. Introduction: Refraction is the bending of a wave when it enters a medium where it's speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media..
Refraction occurs when a wave passes from one medium to another and is bent; that is, the wave deviates from the straight-line path it would have otherwise followed. For example, light passing through a prism is bent when it enters the prism and again when it leaves the prism. The light is therefore refracted. Light striking a mirror bounces off the silver backing without entering it. The light is therefore reflected. The boundary between the media does not have to be abrupt for reflection or refraction to occur. On a hot day, the air over the surface of an asphalt road is warmer than the air above it. Because light travels at different speeds in these two regions, we see an image that shimmers because its light waves are refracted......

Answer 2

Answer:

The return of light into the same medium after striking a surface is called reflection. Some terms related with reflection are – 1. Incident Ray - The light ray striking a reflecting surface is called the incident ray. 2. Reflected Ray – The light ray obtained after reflection from the surface in the same medium in which incident ray is traveling. 3. Normal – The perpendicular drawn to the reflecting surface at the point of incidence is called the Normal. 4. Angle of Incidence – The angle which the incident ray makes with the normal at the point of incidence. It is denoted by the letter ‘i’. 5. Angle of Reflection – The angle which the reflected ray makes with the Normal at the point of incidence. It is denoted by the letter ‘r’.

Laws of reflection –

i. The angle of incidence ‘i’ is equal to the angle of reflection ‘r’. ii. The incident ray, the reflected ray and the normal at the point of incidence lie in the same plane. [pic]

Exercise –

1. What do you mean by the reflection of light?

2. Explain the following terms –

a. Incident Ray

b. Reflected Ray

3. What are the laws of Reflection?

4. Find the number of images formed if an object is placed in-between two mirrors inclined at an angle of : a. 40°

b. 60°

5. Draw the image of the letter P as seen in the mirror (ray diagram not required)