Draw a ray diagram and also state the nature of the image formed by concave mirror when the object is placed at the Centre of curvatureWith a help of a ray diagram, state the meaning of refraction of light. State Snell’s law of refraction of light and also express it mathematically.
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Answer:
When the object is placed at the center of curvature of a concave mirror, i.e. point C, The image will be formed at center of curvature only. The image will be real, inverted and of same size as that of the object.
Law of refraction of light .
Refraction of light is defined as the bending of light when the light ray passes from one medium to another. Snell's law of refraction states that the ratio of Sine of the angle of incidence to the sine of refraction is constant for a given pair of media. It establishes a relation between angle of incidence and angle of refraction.
It can be expressed mathematically as follows:
Given: The refractive index of air with respect to glass is - 2/3
Refractive index of water with respect to air = 4/3.
Speed of light in glass = 2x10^8 m/s
(II) Refractive index of water w.rt air = 4/3
On calculating we get velocity of light in water-2.25x108 m/s.
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