30 Questions
What is the minimum distance required between two pillars for a person to distinguish between them, located 11 km away?
3.2 m
Which of the following is a characteristic of Hypermetropia?
Distant objects are not seen clearly but nearer objects are clearly visible
What is the reason for Hypermetropia?
Focal length or radii of curvature of lens increases or power of lens decreases
How can Hypermetropia be corrected?
By using a concave lens of suitable focal length
What is the angle of resolution of the human eye?
1 minute of arc
What is the minimum distance at which a normal eye can see objects clearly?
25 cm
What is the minimum time interval between two consecutive light pulses that can be distinguished by the eye?
0.1 sec
What is the minimum angular displacement between two objects that can be resolved by the eye?
1'
What is the term for the ability to see objects using both eyes?
Binocular vision
What is the part of the eye where the optic nerve goes to the brain and is not sensitive to light?
Blind spot
What is the focal length of the lens used to correct myopia for a person who wants to see an object at distance D?
f = xy/(x-y)
What is the main cause of presbyopia?
Loss of power of accommodation
What type of lens is used to correct astigmatism?
Cylindrical lens
What is the magnifying power of a microscope given by?
m = β/α
What is the formula for magnification when the final image is formed at D and ∞ for a simple microscope?
mD = 1 + D/f
What is the refractive index of the eye lens?
1.437
What happens to the radius of curvature of the eye lens when ciliary muscles contract?
It decreases
What is the purpose of the yellow spot in the retina?
To increase image brightness
What is the significance of the power of accommodation in the human eye?
It enables the eye to focus on objects at different distances
What is the minimum distance at which a normal eye can see objects clearly?
25 cm
What is the minimum angular displacement required for the human eye to distinguish between two objects?
1/60 of a degree
What is the effect of increasing the focal length of a corrective lens for hypermetropia?
It reduces the power of the lens
What happens to the image formed in the eye in a person with hypermetropia?
The image is formed behind the retina
What is the reason for the limitation of the resolving power of the human eye?
Limited density of photoreceptors in the retina
What is the purpose of using a concave lens to correct hypermetropia?
To reduce the power of the lens
What is the magnification of a simple microscope if the final image is formed at the minimum focal length?
1 + (D/f)
What is the focal length of a lens used to correct myopia for a person who wants to see an object at distance D?
-Dd/(D-d)
What is the condition for a telescope to have maximum magnifying power?
The eyepiece has a small focal length.
What is the effect of increasing the aperture of a telescope on its resolving power?
It increases the resolving power.
Which type of lens is used to correct astigmatism?
Cylindrical lens
Test your understanding of optical instruments and the human eye's resolving power. Calculate the minimum distance between two pillars to be distinguished by the human eye. Explore defects in the eye, such as hypermetropia.
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