An object is situated to the left of a lens. A ray of light from the object is close to and parallel to the principal axis of th
e lens. The ray passes through the lens. Which one of the following statements is true?
The ray passes through a focal point of the lens only if the lens is a converging lens.
The ray passes through the lens without changing direction, no matter whether the lens is converging or diverging.
The ray crosses the principal axis at a distance from the lens equal to twice the focal length, no matter whether the lens is converging or diverging.
The ray passes through a focal point of the lens only if the lens is a diverging lens.
The ray passes through a focal point of the lens, no matter whether the lens is converging or diverging.
The ray passes through a focal point of the lens only if the lens is a converging lens.
The ray passes through the lens without changing direction, no matter whether the lens is converging or diverging.
The ray crosses the principal axis at a distance from the lens equal to twice the focal length, no matter whether the lens is converging or diverging.
The ray passes through a focal point of the lens only if the lens is a diverging lens.
The ray passes through a focal point of the lens, no matter whether the lens is converging or diverging.
1 answer:
Answer:
The ray passes through a focal point of the lens only if the lens is a converging lens.
Explanation:
By the principles of geometric optics, we know that all rays parallel to the principal axis of converging lens, change its direction to a point situated in the axis of the lens. This last point is know as the focal point.
Hence, the only truth choice is:
The ray passes through a focal point of the lens only if the lens is a converging lens.
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Answer:
i. The radius 'r' of the electron's path is 4.23 × m.
ii. The frequency 'f' of the motion is 455.44 KHz.
Explanation:
The radius 'r' of the electron's path is called a gyroradius. Gyroradius is the radius of the circular motion of a charged particle in the presence of a uniform magnetic field.
r =
Where: B is the strength magnetic field, q is the charge, v is its velocity and m is the mass of the particle.
From the question, B = 1.63 × T, v = 121 m/s, Θ =
(since it enters perpendicularly to the field), q = e = 1.6 ×
C and m = 9.11 ×
Kg.
Thus,
r = ÷ sinΘ
But, sinΘ = sin = 1.
So that;
r =
= (9.11 × × 121) ÷ (1.6 ×
× 1.63 ×
)
= 1.10231 × ÷ 2.608 ×
= 4.2266 ×
= 4.23 × m
The radius 'r' of the electron's path is 4.23 × m.
B. The frequency 'f' of the motion is called cyclotron frequency;
f =
= (1.6 × × 1.63 ×
) ÷ (2 ×
× 9.11 ×
)
= 2.608 × ÷ 5.7263 ×
= 455442.4323
f = 455.44 KHz
The frequency 'f' of the motion is 455.44 KHz.