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Physics
UTME / JAMB 1978
Waves and Optics
Solution
The angular dispersion of a prism depends on
A
the index of refraction only
B
the angle of incidence as well as the index of refraction
C
the angle of incidence only
D
the thickness of the prism
E
the prism angle
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Angle of Incidence: Changing the angle at which light strikes the prism affects the angle of refraction, subsequently influencing the dispersion of the light.
Index of Refraction: The prism's index of refraction determines the extent of light bending, which directly impacts the dispersion of different wavelengths.
Source: Myschool Past Questions Archive (Record #29317)
Physics
UTME / JAMB 1978
Waves and Optics
Which of the following is true for the image formed by a convex mirror? i. the image is always virtual ii. the image is always erect iii. the image lies between pole and focus iv. the image is never magnified v. the focus length is negative
A
i only
B
i and ii only
C
ii and iii only
D
i, ii, iii and iv only
E
all five
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #29319)
Physics
UTME / JAMB 1978
Waves and Optics
Solution
A string is sustaining a stationary wave when
A
the frequency of the wave is not proportional to the wavelength of the wave
B
the amplitude of vibration is always zero
C
two equal waves are travelling in opposite directions
D
the waves are longitudinal
E
the frequency is directly proportional to the length of the string
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
-Standing waves are produced on a string when equal waves travel in opposite directions.
-A stretched string is fixed at both ends, when it is plucked at mid point, two reflected waves of same amplitude and frequency at the ends are travelling in opposite direction and overlap along the length. Then the resultant waves are known as the standing waves (or) stationary waves.
Source: Myschool Past Questions Archive (Record #29322)
Physics
UTME / JAMB 1978
Waves and Optics
Diagram
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit from each mirror. The number of images formed is
Attached Figure / Diagram
A
1
B
2
C
3
D
4
E
5
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #41595)