Question

When white light is passed through an upside down (inverted) prism then ………..
(A) When light is obtained
(B) Spectrum is obtained with violet color undergoing maximum and red colour undergoing minimum deviation
(C) Spectrum is obtained with red colour undergoing maximum deviation and violet colour undergoing minimum deviation.
(D) Light gets blocked.

Answer 1

Hint :Here the dispersion of light takes place when the white light is allowed to pass through the prism which dispersed into the seven constituent colours which occurs as the lights of the different colours bend through the different angles when passing through the prism.

Complete Step By Step Answer:
The light of different colours bend through the different angles while passing through the prism and this happens due to the difference in the velocities of the different colours produced when light is passed through the prism. Since, the property of the refractive index of the glass is different for the different colours.
Observe the below diagram of the prism and when the white light is allowed to pass.

Since the wavelength of the violet light is the smallest compared to the red light, the maximum deviation is observed for violet light and the minimum deviation is observed for the red light.
The option B is the correct answer.

Note :
Always remember that the light which has more wavelength will scatter less and will ultimately have the less dispersion. When the white light is allowed to pass through the prism then red colour will deviate least and the violet the deviate most.