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White light is made up of a number of different hues. When light travels through a triangular prism, these hues are often seen. As it travels through the prism, white light is broken into its component colours of red, orange, yellow, green, blue and violet. The separation of visible light into its many hues is known as dispersion, since each colour corresponds to a particular wave frequency in the light and different frequencies of light waves bend at different angles while passing through a prism.
Q1. For _______, the dispersive power will be at its highest.
a) Flint glass
b) Crown glass
c) Mixture of glass
d) None of these
Answer- a) Flint glass,due to its properties it has highest value of refraction
Q2. The prism’s dispersive power is determined by
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,as each material has its own properties,due to which power changes
Q3. An equilateral prism and air have a critical angle of 45 degrees. If the incident ray is parallel to the refracting surface, then the answer is
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.
Q4. What happens when white light goes through an achromatic prism combination?
a) Dispersion
b) Deviation
c) Dispersion and deviation
d) None of the above
Answer- b) Deviation
Q5. For monochromatic light, a prism’s refractive angle is 600, and its refractive index is 2. The angle of incidence for minimal deviation is
a) 60 degrees
b) 45 degrees
c) 30 degrees
d) 75 degrees
Answer- b) 45 degrees,formula used δ=(μ−1)A.
Q6. Which of the following rays is the least deviated by a prism?
a) violet ray
b) green ray
c) red ray
d) yellow ray
Answer- c) Red ray,because of its wavelength
Q7. There is ______ when white light passes through a hollow prism.
a) no dispersion and no deviation
b) Only dispersion
c) Only deviation
d) Both dispersion and deviation
Answer- a) no dispersion and no deviation
Q8. The refracting angle of a prism (=1.5) is 300. A monochromatic beam incident ordinarily on one surface will deviate by
a) 180degree 36’
b) 20degree 30′
c) 18degree
d) 19degree 30′
Answer- a) 180 degree 36’,formula used δ=(μ−1)A.
Q9. If the medium’s dispersion is D for a wavelength l, then the dispersion for wavelength 2l will be
a) D/8
b) D/2
c) 2D
d) D
Answer- a) D/8
Q10. For a prism with a refractive index of 1.5, the angle of the prism is equal to the angle of minimal deviation. What is the value of the prism’s angle?
a) 41 degrees
b) 82 degrees
c) 62 degrees
d) 31 degrees
Answer- b) 82degree,formula used δ=(μ−1)A.
Q11. An equilateral prism and air have a critical angle of 45 degrees. If the incoming ray is perpendicular to the refracting surface, it
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.
Q12. Which of the following rays is the least deviated by a prism?
a) violet ray
b) Green ray
c) red ray
d) yellow ray
Answer- c) Red ray
Q13. The refracting angle of a prism (=1.5) is 300. A monochromatic ray incident properly on one surface will deviate by
a) 18° 36’
b) 20° 30’
c) 18°
d) 19° 30’
Answer- a) 18° 36’
Q14. What is the value of the angle of the prism for a prism of refractive index 1.5?
a) 41°
b) 82°
c) 62°
d) 31°
Answer- b) 82°
Q15. The________ is the arithmetic average of the absolute deviation of a series.
a) Standard deviation
b) Coefficient of mean deviation
c) Mean deviation
d) None of the above
Answer- c) Mean deviation
Q16. What is noticed when white light travels through an achromatic prism combination?
a) Dispersion
b) Deviation
c) Dispersion and deviation
d) None of the above
Answer- b) Deviation
Q17. If the medium’s dispersion is D for a wavelength l, then the dispersion for wavelength 2l will be
a) D/8
b) D/2
c) 2D
d) D
Answer- a) D/8
Q18. For monochromatic light, a prism’s refractive angle is 600 and its refractive index is 2. The angle of incidence for minimal deviation is
a) 60°
b) 45°
c) 30°
d) 75 °
Answer- b) 45°
Q19. The average of a group of integers’ squared departures from the arithmetic mean is__________.
a) Standard deviation
b) Coefficient of mean deviation
c) Mean deviation
d) Variance
Answer- d) Variance
Q20.When white light passes through a hollow prism, it exhibits
a) no dispersion and no deviation
b) Only dispersion
c) Only deviation
d) Both dispersion and deviation
Answer- a) no dispersion and no deviation
Q21.The term _______ refers to the study of observational dispersion.
a) Measure of dispersion
b) Standard deviation
c) Measure of central tendency
d) None of the above
Answer- a) Measure of dispersion
Q22. The first 50 natural numbers have a standard deviation of
a) 12.43
b) 10.43
c) 14.43
d) 16.43
Answer- c) 14.433.
Q23. Determine the coefficient of variation (c)V.) given the following information. 2,4,8,6,10 and 12 are all numbers.
a) 48.86
b) 42.86
c) 40.86
d) 0.49
Answer- a) 48.86, Coefficient of Variation = (Standard Deviation / Mean) * 100
Q24. Determine the standard deviation for the sample data 2,4,6,8,10, and 12. Is________
a) 4.42
b) 2.42
c) 3.42
d) 5.42
Answer- c) 3.42,mean value is calculated here Mean = {Sum of Observation}/{Total numbers of Observations}.
Q25. Standard deviation is generally
a) Negative
b) Positive
c) Zero
d) None of the above
Answer- b) Positive
