preparation of optical instrument
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Physics > Ray Optics and Optical Instruments > Optical Instruments
Ray Optics and Optical Instruments
Optical Instruments
How do see the objects around us? Yes, with our eye. It is a most important organ of the human body which enables us to view all things around us. An eye is one of the most important optical instrument. Let us study in detail about other optical instruments used by us.
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Questions
The magnification of a magnifying lens of focal length 5 cm is : (final image is at
∞
)
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The value of numerical aperature of the objective lens of a microscope is
1.25
. If light of wavelength
5000
˚
A
is used, the minimum separation between two points, to be seen as distinct, will be :
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The instrument that is based on the principle that when an object is placed between first principal focus and the optic centre of convex lens, an upright, virtual and enlarged image on the same side of the object is formed, is
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The Eye
The human eye is an optical instrument that enables us to view all the objects around us is a very complex organ. Let us study the structure of the human eye. The white protective membrane seen when looked into the eye directly is a Sclera. It is tuff, opaque and fibrous outer layer of the eyeball.
The circular part is the Iris. The color of the eye is determined by the color of the iris. The center transparent area of the iris is the Pupil. The iris works like the shutter of the camera. It absorbs most of the light falling on it and allows it to pass through the pupil.
The amount of light that enters the inner part of the eye depends on the size of the pupil. In bright light, the iris contracts the pupil to restrict the light, whereas in low light it widens the pupil to emit more light into the eye. The eyeball is spherical in shape. The retina of the eye is able to detect the light and its color because of the presence of senses known as rods and cones.