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प्रश्न
Match the following:
| Column - I | Column - II | ||
| 1 | Retina | a | Path way of light |
| 2 | Pupil | b | Far point comes closer |
| 3 | Ciliary muscles | c | near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropia | e | Power of accommodation |
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उत्तर
| Column - I | Column - II | ||
| 1 | Retina | d | Screen of the eye |
| 2 | Pupil | a | Pathway of light |
| 3 | Ciliary muscles | e | Power of accommodation |
| 4 | Myopia | b | Far point comes closer |
| 5 | Hypermetropia | c | Near point moves away |
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संबंधित प्रश्न
What is meant by a power of a lens? Define its SI unit.
What can you see in a completely dark room? If you switch on an electric bulb in this dark room as a light source, explain how you could now see:
(a) the electric bulb
(b) a piece of white paper
The focal length of a convex lens is 25 cm. What is its power?
A converging lens has focal length of 50 mm. What is the power of the lens?
The optician's prescription for a spectacle lens is marked +0.5 D. What is the:
(a) nature of spectacle lens?
(b) focal length of spectacle lens?
Define the term focal length of a lens.
Express the power (with sign) of a concave lens of focal length 20 cm.
A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity?
How is accommodation produced?
An object is placed in front of a converging lens. Obtain the conditions under which the magnification produced by the lens is
- negative and
- positive.
