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Q 01 / 25
The human eye forms the image of an object at the retina.
Q 02 / 25
The iris controls the size of the pupil.
Q 03 / 25
The least distance of distinct vision for a normal human eye is 15 cm.
Q 04 / 25
Myopia is corrected using a convex lens.
Q 05 / 25
Hypermetropia is also called far-sightedness.
Q 06 / 25
People with presbyopia can see nearby objects clearly.
Q 07 / 25
The human eye can focus both near and distant objects by changing the shape of its lens.
Q 08 / 25
Atmospheric refraction causes the twinkling of stars.
Q 09 / 25
The splitting of white light into its constituent colors is called dispersion.
Q 10 / 25
The phenomenon of rainbow formation is not related to refraction.
Q 11 / 25
Blue color has the longest wavelength among visible light colors.
Q 12 / 25
Twinkling of planets is more prominent than twinkling of stars.
Q 13 / 25
The retina contains rod and cone cells for vision.
Q 14 / 25
Concave lenses are used to correct hypermetropia.
Q 15 / 25
Red light is scattered least by the atmosphere.
Q 16 / 25
The sky appears blue due to scattering of sunlight by atmospheric particles.
Q 17 / 25
Rainbow always forms in the direction opposite to the sun.
Q 18 / 25
Power of accommodation is the eye’s ability to focus objects at various distances.
Q 19 / 25
Persistent vision lasts for about 1 second on the retina.
Q 20 / 25
Advanced sunrise and delayed sunset are due to atmospheric refraction.
Q 21 / 25
Reflection and refraction are both involved in the working of the human eye.
Q 22 / 25
Color blindness is caused by defects in rod cells.
Q 23 / 25
The spectrum formed by a prism contains seven colors.
Q 24 / 25
Presbyopia can sometimes require bifocal lenses for correction.
Q 25 / 25
White light is made up of five primary colors.

Frequently Asked Questions

The human eye enables us to see objects by detecting and focusing light on the retina.

It is the minimum distance at which a normal eye can see objects clearly, about 25 cm.

The pupil is the eye opening that controls the amount of light entering the eye.

The iris is the colored part of the eye that regulates the size of the pupil.

It is the eye's ability to focus on distant and near objects by adjusting lens shape.

Stars twinkle due to atmospheric refraction of their light by Earth's unsteady atmosphere.

Myopia is near-sightedness, hypermetropia is far-sightedness—both are vision defects.

Myopia is corrected using concave lenses.

Hypermetropia is corrected using convex lenses.

Presbyopia is age-related loss of eye's ability to focus on nearby objects.

It is the bending of light as it passes through different layers of Earth's atmosphere.

Both occur due to atmospheric refraction bending sunlight.

Dispersion is the splitting of white light into its component colors by a prism.

A rainbow forms from sunlight dispersion, refraction, and internal reflection by raindrops.

It is the time for which an image stays on the retina after exposure ends (about 1/16th second).
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