When light is incident parallel to the principal axis and then strikes a lens, the light will refract through the focal point on the opposite side of the lens.
To find the answer, we have to know about the rules followed by drawing ray-diagram.
<h3>What are the rules obeyed by light rays?</h3>
- If the incident ray is parallel to the principal axis, the refracted ray will pass through the opposite side's focus.
- The refracted ray becomes parallel to the major axis if the incident ray passes through the focus.
- The refracted ray follows the same path if the incident light passes through the center of the curve.
Thus, we can conclude that, when light is incident parallel to the principal axis and then strikes a lens, the light will refract through the focal point on the opposite side of the lens.
Learn more about refraction by a lens here:
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Explanation:
Let thermal capacity of the vessel be C' J K-1
Heat energy given by hot water = 40 x 4.2 x (60 - 30) = 5040 J
Heat energy taken by cold water = 50 x 4.2 x (30 - 20) = 2100 J
Heat energy taken by vessel = C' x (30 - 20) = 10 C' J
If there is no loss of heat energy,
Heat energy given by hot water = Heat energy taken by cold water and vessel
or 5040 = 2100 + 10 C'
or 10 C' = 2940
or C'= 294 J K-1
Thus, thermal capacity of vessel = 294 J K-1.
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Answer:
Vs = 6.73 m/s or Vs = 16.3 m/s
Explanation:
frequency of the trains whistle (f) = 1.64 x 10^{2} Hz = 164 Hz
frequency of beats heard = 4 beats/s = 4 Hz
velocity of the stationary train (Vr) = 0
velocity of sound in air (V) = 343 m/s
velocity of the moving train (Vs) = ?
we can get the velocity of the moving train from the formula below
Fn = f x 
...equation 1
where Fn = net frequency
- case one - assuming the train is approaching the station Fn = 164 + 4 = 168 Hz
substituting the known values into equation 1
168 = 164 x 
1.02 =
Vs = 
Vs = 6.73 m/s
- case two - assuming the train is leaving the station Fn = 164 - 4 = 160 Hz
substituting the known values into equation 1
168 = 160 x
1.05 =
Vs = 
Vs = 16.3 m/s
Answer: the colors come from the interference of light waves reflected from the opposite surfaces of the gasoline film. The correct option is 1.
Explanation:
These bright colours that are constructively produced under sunlight occurs due to interference of light waves reflected from the outer and inner surfaces of the thin layer of gasoline floating on water.
Thin film interference is a natural event that occurs due to reflection of interfered light waves from opposite surfaces of a thin film.
To know whether interference is constructive or destructive, you must determine if there is a phase change upon reflection. Thin film interference depends on.:
- film thickness,
-the wavelength of light, and
- the refractive indices.
For white light incident on a film that varies in thickness, you will observe rainbow colors of constructive interference for various wavelengths as the thickness varies.
