18 Questions
What is the reason for the defect mentioned in the text?
Gradual weakening of ciliary muscles
What type of lenses are recommended for correcting the defect discussed?
Bifocal lenses
What does the upper portion of a bifocal lens usually consist of?
Concave lens
What is the angle between the lateral faces of a prism called?
Angle of Prism
What phenomenon occurs when white light passes through a glass prism?
Dispersion
Who was the first to obtain a spectrum of sunlight using a glass prism?
Isaac Newton
Why does the sky appear dark instead of blue to an astronaut?
Because the astronaut is outside the Earth's atmosphere.
What is the nature of the image formed by our eye?
Real and inverted
What is the phenomenon responsible for the blue color of the sky?
Scattering of light
How can you remove the defect of vision 'Presbyopia'?
Wearing reading glasses
What is the phenomenon responsible for the formation of a rainbow?
Dispersion
What do you understand by 'Power of Accommodation'?
Ability of the eye to adjust focus from far to near objects
What is the main function of the ciliary muscles in the eye?
Adapting the focal length of the eye lens
How does the eye lens accommodate to allow clear vision of nearby objects?
By becoming thicker and decreasing the focal length
What happens to the eye lens when the ciliary muscles relax?
The eye lens becomes thin and the focal length decreases
What is the effect of the iris contracting on the pupil size?
The pupil contracts to reduce light entering the eye
How does the power of accommodation in the eye help in vision?
By enabling clear vision of distant and nearby objects
What is the significance of the near point of the eye being 25cm?
It represents the minimum distance for clear vision without strain
Learn about how the pupil functions in the human eye to regulate the amount of light entering and affecting vision. Explore how the pupil adjusts in response to different lighting conditions and environments, impacting our ability to see clearly.
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