EASY
Earn 100

Myopia is due to

50% studentsanswered this correctly

Important Questions on Ray Optics

MEDIUM
Physics>Optics>Ray Optics>Optical Instruments: Human Eye

To rectify which defects in the eye's vision, spectacles of convex lens and concave lens are used?

EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
What is myopia? How to rectify it?
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A person uses spectacles of power +2D. What type of defect of vision is it?
EASY
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 :
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A myopic person uses a lens of power -1.25 D. What is his far point?
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The change in focal length of an eye-lens is caused by the action of the_____.
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A defect of vision  in which lines in one plane of an object appears in focus while those in another plane are out of focus is called ______.
MEDIUM
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The human eye has a lens which has a:
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye

Draw a ray diagram to show the correction of a myopic eye.The near point of the person with the defective eye is 75 cm.from the eye. Find the power of lens required to see clearly at 25 cm

 

MEDIUM
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The far point of a myopic person is 70 cm in front of the eye. Calculate the focal length and power of the lens needed by him to see the distant objects clearly.
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
The least distance of distinct vision for a normal eye is
EASY
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 :
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
How the eye of a person suffering from myopia can be corrected . Explain with the help of a ray diagram.
EASY
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)
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
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A short sighted person can read a book clearly at a distance of 10 cm from the eyes. The lenses required to read the book kept at 60 cm are
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A person wears glasses of power -2.5 D. Is the person farsighted or nearsighted? What is the far point of person without the glasses?
MEDIUM
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
A man wearing glasses of focal length +1 m cannot clearly see beyond 1 m
EASY
Physics>Optics>Ray Optics>Optical Instruments: Human Eye
What is myopia? Which lens is used for its correction? 
MEDIUM
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