Physics
Grade-10
Easy
Question
How does the iris control the amount of light entering the eye?
- By contracting
- By relaxing
- By increasing/decreasing the pupil size
- All of the above
Hint:
We see objects due to light falling on them. We can't see in high light as well as low light.
The correct answer is: All of the above
The correct option is d) All of the above.
The colored part of the eye that helps regulate the amount of light entering the eye. In bright light, the iris closes or contracts the pupil to let in less light. Also, in low light, the iris opens or relaxes the pupil to let in more light. Focus the light rays onto the retina.
Related Questions to study
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A man wears a pair of spectacles of power +3.5. Which of the following statements is correct about him?
I. He is farsighted.
II. He wears concave lenses
III. The focal length of the lens of his spectacles is positive
IV. His near point is farther than 25 cm from his eyes without lenses
A man wears a pair of spectacles of power +3.5. Which of the following statements is correct about him?
I. He is farsighted.
II. He wears concave lenses
III. The focal length of the lens of his spectacles is positive
IV. His near point is farther than 25 cm from his eyes without lenses
PhysicsGrade-10
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Which of the following parts of the eye focuses most of the light?
Which of the following parts of the eye focuses most of the light?
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The size of the pupil increases when ____.
The size of the pupil increases when ____.
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The power of the lens used by Roshan is +2.5 D. What type of lens does he use?
The power of the lens used by Roshan is +2.5 D. What type of lens does he use?
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In the whole process of seeing an object, the light undergoes ____ outside the eyes and ____ inside the eyes.
In the whole process of seeing an object, the light undergoes ____ outside the eyes and ____ inside the eyes.
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The power of the lens used by Priyanka is –2.25 D. Which of these eye defects she probably has?
The power of the lens used by Priyanka is –2.25 D. Which of these eye defects she probably has?
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Mona wears a pair of eye lenses of focal length 1.6 m. What is the type of lenses?
Mona wears a pair of eye lenses of focal length 1.6 m. What is the type of lenses?
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Salma wears a pair of eye lenses of focal length - 80 cm. What is the power of the lenses?
Salma wears a pair of eye lenses of focal length - 80 cm. What is the power of the lenses?
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The corrective lens for a hypermetropia eye is ____.
The corrective lens for a hypermetropia eye is ____.
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Read the following statements and choose the correct answer.
I: Assertion: In a myopic eye, the light rays are focused in front of the retina.
II: Reason: The light rays can be focused on the retina by using a convex lens.
Read the following statements and choose the correct answer.
I: Assertion: In a myopic eye, the light rays are focused in front of the retina.
II: Reason: The light rays can be focused on the retina by using a convex lens.
PhysicsGrade-10
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Match the following:
Match the following:
PhysicsGrade-10
Physics
To a person with myopia, the nearby objects appear _____ and the distant objects appear_____.
To a person with myopia, the nearby objects appear _____ and the distant objects appear_____.
PhysicsGrade-10
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What is the eye defect shown in the picture below?
The correct option is a)Myopia.
- Nearsightedness or myopia is an eye condition caused by a refractive error that causes distant objects to appear blurry. A nearsighted person can clearly see nearby objects.
- Myopia means that the focus of the eye is in front of the retina instead of on it. The retina is the surface at the back of the eye that collects light.
- It converts light into electrical impulses that the brain interprets as images. Blurry vision can occur when the eye focuses light in front of the retina.
What is the eye defect shown in the picture below?
PhysicsGrade-10
The correct option is a)Myopia.
- Nearsightedness or myopia is an eye condition caused by a refractive error that causes distant objects to appear blurry. A nearsighted person can clearly see nearby objects.
- Myopia means that the focus of the eye is in front of the retina instead of on it. The retina is the surface at the back of the eye that collects light.
- It converts light into electrical impulses that the brain interprets as images. Blurry vision can occur when the eye focuses light in front of the retina.
Physics
A woman wears a pair of spectacles of power – 0.5. Which of the following statements is correct about her?
I. She is shortsighted.
II. She wears concave lenses.
III. The focal length of the lens of her spectacles is negative
IV. Her near point is farther than 25 cm from his eyes without lenses
A woman wears a pair of spectacles of power – 0.5. Which of the following statements is correct about her?
I. She is shortsighted.
II. She wears concave lenses.
III. The focal length of the lens of her spectacles is negative
IV. Her near point is farther than 25 cm from his eyes without lenses
PhysicsGrade-10
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The power of the lens used by Priyanka is –2.25 D. Which type of lens does she use?
The power of the lens used by Priyanka is –2.25 D. Which type of lens does she use?
PhysicsGrade-10
