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Human eye forms the image of an object at its _____.

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Important Questions on Ray Optics

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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The least distance of distinct vision for a normal eye is
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The human eye has a lens which has a:
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A near sighted person has a far point of 20 cm in front of his eye. What is the power of the lens (in dioptres) which will allow this person to see distant objects clearly?
MEDIUM
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A person can see clearly object only when they lie between 50 cm to 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A student studying the similarities and differences between a camera and the human eye makes the following observations:
I Both the eye and the camera have convex lenses.
IIIn order to focus, the eye lens expands or contracts while the camera lens moves forward or backward.
III The camera lens produces upside down real images while the eye lens produces only upright real images.
IV A screen in camera is equivalent to the retina in the eyes.
V A camera adjusts the amount of light entering in it by adjusting the aperture of the lens. In the eye the cornea controls the amount of light. The correct statements are :
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
Your friend is having eye sight problem. She is not able to see clearly a distant uniform window mesh and it appears to her as nonuniform and distorted. The doctor diagnosed the problem as :
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
What power should the reading spectacles (lens) have for a person for whom the least distance is 50 cm (in dioptre)
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The change in focal length of an eye-lens is caused by the action of the_____.
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
For a normal eye, the least distance of distinct vision is
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A man's near point is 0.5 m and the far point is 3 m. Power of spectacle lenses required for
(i) reading purposes
(ii) seeing distant objects, respectively are
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A professor reads a greeting card received on his 50th birthday with + 2.5 D glasses keeping the card 25 cm away. Ten years later, he reads his farewell letter with the same glasses but he has to keep the letter 50 cm away. What power of lens should he now use?
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The least distance of distinct vision for a young adult with normal vision is about
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A lamp is hanging at a height of 40 cm from the centre of the table. If its height is increased y 10 cm, the illuminance of the lamp will decreased by
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A young boy can adjust the power of his eye-lens between 50 D and 60 D. His far point is infinity then
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
In Huygen's eyepiece
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
When we enter a cinema hall, we cannot see properly for a short time. This is because :
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The near point and far point of a child are at 10 cm and 100 cm. If the retina is 2.0 cm behind the eye - lens, what is the range of the power of the eye-lens ?
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A person can see objects clearly only upto a maximum distance of 50 cm. His eye defect, nature of the corrective lens and its focal length are respectively
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
Myopia vision is corrected by wearing 
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Physics>Optics>Ray Optics>Optical Instruments: Human Eye
Laser light has the following property