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Formation of rainbow | Explain the formation of rainbow Formation of rainbow | Explain the formation of rainbow :- One of the most interesting sources of color in nature is the rainbow. The basic cause of the formation of rainbow is a combination of refraction, internal reflection and dispersion of light by the rain…
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Maximum deviation in prism Maximum deviation in prism :- The angle of deviation of light ray while passing through a glass prism is maximum when the angle of incidence at interface AB is maximum, i.e., when i1 = 90°. Now as Here as i1 = 90° ⇒ r1 = C, applying Snell’s Law at interface…
Condition for grazing emergence Condition for grazing emergence :- For grazing emergence, i2 = 90°, we can determine the angle of incidence i1 for such grazing emergence. As for a prism, Applying Snell’s Law at interface AB, we get Note :- The light ray will emerge out of the prism only if the angle of…
Condition of no emergence Condition of no emergence :- The light ray entering the prism at interface AB, will not be able to come out from the interface AC, if total internal reflection takes place at this interface. For this the minimum value of angle of incidence at interface AC must be greater than critical…
A ray of light falling at an angle of 50 Question :- A ray of light falling at an angle of 50° is refracted through a prism and suffers minimum deviation. The angle of the prism is 60° . Find the angle of minimum deviation and refractive index of the material of the prism….
Prism formula | Derivation of prism formula Prism formula | Derivation of prism formula :- As we have seen in article Condition for minimum deviation in a prism, in case of minimum deviation, i1 = i2 = i (let) and r1 = r2 = r (let) Now as , so in case of minimum deviation,…
Condition for minimum deviation in a prism Condition for minimum deviation in a prism :- The angle of deviation of a light ray, while passing through a prism is given by : Here, cannot be negative and A cannot be zero, hence for deviation(δ) to be minimum, we have, It means in case of…
Deviation produced by thin prism Deviation produced by thin prism :- A prism with small angle of prism(refracting angle or apex angle) A ≤ 10°, is called a thin prism. Thin prisms introduce small angular beam deviations(δ) and this deviation is approximately independent of the angle of incidence. Considering the figure of previous article…
Refraction of light through a prism Refraction of light through a prism :- Consider a monochromatic light ray PQ incident on the face AB of prism ABC of angle of prism A and refractive index μ. Let PQ = incident ray QR = refracted ray RS = emergent ray A = Angle of prism i1…
Prism Prism :- Any transparent medium bounded by any number of surfaces such that the surface on which light is incident and the surface from which light emerges are plane and not parallel is called a prism. Angle of prism/Refracting angle of prism The angle between the faces on which light is incident and from…