# Prism theory and Dispersion of light MCQs for NEET

NEET  Physics is the scoring paper in the medical entrance examination. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Physics Prism theory and Dispersion of light Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.

## MCQ 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: (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

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’

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°

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: (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

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

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 °

9. The dispersive power will be maximum for
(a) Flint glass
(b) Crown glass
(c) Mixture of glass
(d) None of these