How does a camera change the focus at different distances? What is refraction, a
ID: 1621157 • Letter: H
Question
How does a camera change the focus at different distances? What is refraction, and what is its cause? Draw an example of refraction. The speed of light in ice is 2.29 times 10^8 m/s. What is the index of refraction of ice? A flashlight beam strikes the surface of a pane of glass (n = 1.50) at a 56 degree angle to the normal. is the angle of refraction? The critical angle for a certain liquid-air surface is 48.0 degree. What is the index of refraction of the Describe what happens when radiation strikes a surface at the critical angle, at an angle less than critical angle, and at an angle greater than the critical angle. How does the polarizing film found in polarized sunglasses work? What will happen if the two of polarizing film are overlapped so that their slits are at right angles to each other? Parallel to each other? An electromagnetic wave has a wavelength of 10m, if the wave travels at 3 times 10^8 m/s, what is the frequency of this wave? For someone who is nearsighted, where is light focused relative to the retina? For someone who is farsighted?Explanation / Answer
As you asked multiple questions so i am bound to answer first 5 questions.
45.
As we know from lense formula,
1 / f = 1 / v + 1 / u
if we change the object distance, image distance will also change so focus of camera will also change the focus.
46.
Refraction of light is bending of light or change in direction of light as it enters a differerent medium.
lt passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the
two media and away from the normal in case of slow to fast medium.
Cause - lt accur due to change waves transmission medium which causes it to bent towards or away from normal.
47.
v = 2.29*10^8 m/s
n = c / v = 3*10^8 / 2.29*10^8
n = 1.31
48.
From snell's law,
n1*sini = n2*sinr
1*sin(56) = 1.5*sinr
r = 33.5 deg
49.
n = 1 / sinc
n = 1 / sin48
n = 1.34
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