The eye can focus on objects ranging between the near point and the far point. In humans with perfect vision, what is approximately the distance of the near point and the far point?
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10 cm and 50 m
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5 cm and 100 m
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25 cm and infinity
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2 m and infinity
Q.2.
The focal length of a lens is determined by what?
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The refractive index of the material from which the lens is made
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The curvature of one surface of the lens
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The curvature of the two surfaces of the lens
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Both the refractive index of the material from which the lens is made and the curvature of the two surfaces of the lens
Q.3.
Which answer is not a part of the structure of the eye?
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Retina
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Malleus
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Ciliary muscle
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Cornea
Q.4.
A CCD in a digital camera is the equivalent of what in the eye?
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Lens
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Cornea
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Pupil
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Retina
Q.5.
What types of lenses are used to correct long and short sightedness?
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Convex and concave
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Convex and planar
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Planar and bi-convex
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Bi-concave and bi-convex
Q.6.
What is the power of a lens whose focal length is 0.1 m?
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2 D
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5 D
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10 D
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100 D
Q.7.
What is the formula for the power of a lens?
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P = 1⁄f
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P = 1⁄2f
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P = 2⁄f
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P = 2⁄3f
Q.8.
What is/are a cause(s) of short sightedness?
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Eyeball being too long
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Lens unable to focus
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The eyeball being too short
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Both eyeball being too long and lens unable to focus
Q.9.
A manufacturer wants to make a flatter (less curved) lens for a given focal length. How would the manufacturer make this?
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Make the lens using a material with a higher refractive index
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Make the lens using a material with a lower refractive index
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They cannot make a flatter lens
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Use a material with the same refractive index but one that they can cut thinner
Q.10.
What is/are a cause(s) of long sightedness?
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Eyeball being too short
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Lens unable to focus
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Eyeball too long
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Both eyeball being too short and lens unable to focus
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