Please select a subject first
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Rewrite the following table so as to match second and third column with first column.
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Column I
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Column II
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Column III
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(i) Myopia
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Old age problem
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Bifocal lens
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(ii) Presbyopia
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Nearsightedness
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Concave lens.
|
Concept: Defects of Vision and Their Corrections > Myopia
Choose the correct alternative and rewrite the following:
Mirror used by a dental surgeon is ..........................
Concept: Spherical Mirrors
A _____________ mirror is used by a dentist.
Concept: Spherical Mirror > Concave Mirror
Concept: Spherical Mirror > Concave Mirror
In which equipment/s do you find ___________________
Concept: Spherical Mirror > Concave Mirror
My grandfather uses a bifocal lens in his spectacle. Explain why.
Concept: Images Formed by Sperical Lenses
If an object is placed in front of a convex lens beyond 2F1, then what will be the position, relative size, and nature of an image which is formed? Explain with a ray diagram.
Concept: Convex Lens
Concept: Convex Lens
Answer the following question:
Distinguish between the convex mirror and the concave mirror.
Concept: Spherical Mirrors
Anuja cannot see the blackboard writing but she can see nearby things.
(a) What is the eye defect she is suffering from?
(b) State the possible reason for her defect.
(c) How is it corrected
Concept: Defects of Vision and Their Corrections > Myopia
In Myopia the human eye _______.
Concept: Defects of Vision and Their Corrections > Myopia
Write scientific reason.
Nearsightedness, this defect can be corrected by using spectacles with concave lens.
Concept: Defects of Vision and Their Corrections > Myopia
If focal length of a convex lens is 20 cm at what is the power of the lens?
Concept: Power of a Lens
Observe the figure whether it is correct or not and explain the phenomenon.

Concept: Defects of Vision and Their Corrections > Myopia
The power of convex lens of focal length 20 cm is ______.
Concept: Power of a Lens
Observe the figure and answer the following questions:

- Name the defect of vision represented in the above figure.
- State the reasons for this defect.
- How is it corrected?
- Draw the diagram to show the correction of this defect.
Concept: Defects of Vision and Their Corrections > Myopia
Concept: Spherical Mirror > Concave Mirror
Concept: Spherical Mirror > Concave Mirror
Complete the following table by observing the given figures:
| Figure → | ![]() |
![]() |
| Points ↓ | ||
| (a) Name of the defect | ______ | ______ |
| (b) Position of the image | ______ | ______ |
| (c) Lens used to correct the defect | ______ | ______ |
Concept: Defects of Vision and Their Corrections > Myopia
When a ray of light travels from air to glass slab and strikes the surface of separation at 90°, then it …………….
(a) bends towards normal
(b) bends away from normal
(c) passes unbent
(d) passes in zigzag way
Concept: Refraction of Light Through a Rectangular Glass Block


