Home
>
NCERT Solutions NCERT Solutions
>
Science

Chapter 10 NCERT Class 10 Science SOLUTIONS

4. The change in focal length of an eye lens is caused by the action of the : (a) pupil (b) retina. (c) ciliary muscles. (d) iris
popup image

Question:

The change in focal length of an eye lens is caused by the action of the :

(a) pupil                                     (b) retina

(c) ciliary muscles                    (d) iris

Answer:

(c) ciliary muscles

mic-icon

More NCERT Questions

Download Free PDF
(All Q's of this Chapter solved)
question pointer

Why does the sky appear dark instead of blue to an astronaut?

question pointer

Why do planets not twinkle?

question pointer

Why are normal eyes not able to see clearly objects placed closer than 25 cm?

question pointer

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

question pointer

The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

question pointer

A person needs a lens of power –5.5 dioptres for correcting his distant vision. For correcting his near vision, he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting : (i) distant vision, and (ii) near vision?

question pointer

The least distance of distinct vision for a young adult with normal vision is about (a) 25 m (b) 2.5 cm (c) 25 cm (d) 2.5 m

question pointer

The human eye forms the image of an object at its : (a) cornea (b) iris (c) pupil (d) retina

question pointer

The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to : (a) presbyopia (b) accommodation (c) near-sightedness (d) far-sightedness

question pointer

A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?

question pointer

What is the far point and near point of the human eye with normal vision?

question pointer

A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?

question pointer

What is meant by power of accommodation of the eye?

question pointer

Name the substance which on treatment with chlorine yields bleaching powder.

Related Topics

Connect With Us
Calling icon
+91-7217012258
email icon
[email protected]
Explore Books
Free Study Material
Teacher's Resources
Work With Us
Company
Explore Books
Free Study Material
Teacher's Resources
Work With Us
Company
© 2026, Agrawal Group of Publications  All rights reserved.