300+ TOP MCQs on Prism theory and Dispersion of light and Answers

NEET  Physics is the very imporatant paper in the Medical Entrance EXAM. So these NEET Physics MCQs and Answers for all Concepts as per the new syllabus. Practice daily with these NEET Physics objective questions on air pollution . NEET Physics Prism theory and Dispersion of light Multiple Choice Questions

MCQs on Prism theory and Dispersion of light :

1. The critical angle between an equilateral prism and air is 45. If the incident ray is perpendicular to the refracting surface, then
(A) It is reflected totally from the second surface and emerges perpendicular from the third surface.
(B) It gets reflected from second and third surfaces and emerges from the first surface
(C) It keeps reflecting from all the three sides of the prism and never emerges out
(D) After deviation, it gets refracted from the second surface

Answer

Answer: (A) It is reflected totally from the second surface and emerges perpendicular from the third surface.

2. Which ray is least deviated by a prism?
(A) Violet ray
(B) Green ray
(C) Red ray
(D) Yellow ray

Answer

Answer: (C) Red ray

3. A prism (μ=1.5) has a refracting angle of 30⁰. The deviation of a monochromatic ray incident normally on its one surface will be
(A) 18° 36’
(B) 20° 30’
(C) 18°
(D) 19° 30’

Answer

Answer: (A) 18° 36’

4. The angle of the prism is equal to the angle of minimum deviation for a prism of refractive index 1.5. What is the value of the angle of the prism?
(A) 41°
(B) 82°
(C) 62°
(D) 31°

Answer

Answer: (B) 82°

5. The dispersive power of prism depends upon
(A) The shape of the prism
(B) The material of the prism
(C) The angle of the prism
(D) Height of the prism

Answer

Answer: (B) The material of the prism

6. When white light passes through the achromatic combination of prism, then what is observed
(A) Dispersion
(B) Deviation
(C) Dispersion and deviation
(D) None of the above

Answer

Answer: (B) Deviation

7. For a wavelength l the dispersion of the medium is D, then the dispersion for the wavelength 2l will be
(A) D/8
(B) D/2
(C) 2D
(D) D

Answer

Answer: (A) D/8

8. The refractive angle of a prism for a monochromatic light is 60⁰ and refractive index is √2. For minimum deviation, the angle of incidence will be
(A) 60°
(B) 45°
(C) 30°
(D) 75 °

Answer

Answer: (B) 45°

9. The dispersive power will be maximum for
(A) Flint glass
(B) Crown glass
(C) Mixture of glass
(D) None of these

Answer

Answer: (A) Flint glass

10. When white light is passed through a hollow prism then there is
(A) no dispersion and no deviation
(B) Only dispersion
(C) Only deviation
(D) Both dispersion and deviation

Answer

Answer: (A) no dispersion and no deviation