A camera has a circular aperture immediately behind the lens. Reducing the aperture diameter to half its initial value will
A. Make the image blurry.
B. Cut off the outer half of the image and leave the inner half unchanged.
C. Make the image less bright.
D. All the above.
Explain your choice.
c.) Make the image less bright.
Make the image blurry
A camera, takes a picture by using a lens to form a real, inverted image on a light-sensitive detector in a light-tight box. Film was the detector of choice for well over a hundred years, but today's digital cameras use an electronic detector called a charge-coup led device.
Cut off the outer half of the image and leave the inner half unchanged.
The camera "lens" is always a combination of two or more individual lenses. The simplest such lens consists of a converging lens and a somewhat weaker diverging lens. This combination of positive and negative lenses corrects some of the defects inherent in single lenses.
Make the image less bright.
We can model a combination lens as a single lens with an effective focal length (usually called simply "the focal length") f. A zoom lens changes the effective focal length by changing the spacing between the converging lens and the diverging lens, this is what happens when the lens barrel on your digital camera moves in and out as you use the zoom.
All the above.
A typical digital camera has a lens whose effective focal length can be varied from 6 mm to 18 mm, giving a 3X zoom. A camera has a circular apertur e immediately behind the lens. Since, as aperture will be reduced, less light rays from part of the object will be entering the camera. This will cause the image to get dimmer and less brighter.
So, the answer is C).Make the image less bright.
Your task in physics laboratory is to make a microscope from two lenses. one lens has a focal length of the other objective, and you want the eyepiece to be from the objective.
(a). For viewing with a relaxed eye, how far should the sample be from the objective lens?
(b). What is the magnification of your microscope?
A hydrogen discharge lamp emits light with two prominent wavelengths: (red) and (blue). The light enters
a flint-glass prism perpendicular to one face and then refracts
through the hypotenuse back into the air. The angle between
these two faces is .
a. Use Figure to estimate to the index of refraction
of flint glass at these two wavelengths.
b. What is the angle (in degrees) between the red and blue light
as it leaves the prism?
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