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.
I attached an image to illustrate this situation
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Answer:
a )
b)
Explanation:
given data:
pressure ration rp = 12
inlet temperature = 300 K
TURBINE inlet temperature = 1000 K
AT the end of isentropic process (compression) temperature is
AT the end of isentropic process (expansion) temperature is
isentropic work is given as
w = 1.005(610.18 - 300)
w = 311.73 kJ/kg
w(turbine) = 1.005( 1000 - 491.66)
w(turbine) = 510.88 kJ/kg
a) mass flow rate for isentropic process is given as
b) actual mass flow rate uis given as