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प्रश्न
Fill in the following blank with suitable word:
For converging lenses, the power is __________ while for diverging lenses, the power is ___________.
उत्तर
For converging lenses, the power is positive while for diverging lenses, the power is negative.
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संबंधित प्रश्न
Define the power of a lens.
Give the usual name for the following:
A point inside a lens through which the light passes undeviated.
A converging lens has focal length of 50 mm. What is the power of the lens?
State the condition for the following a lens has both its focal lengths equal .
Define the term power of a lens.
A normal eye is not able to see objects closer than 25 cm because
A symmetric double convex lens in cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power a cut-lens will be
The power of a lens is +2.0 D. Find its focal length and state the kind of lens.
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 |
The focal length of a double convex lens is equal to the radius of curvature of either surface. What is the refractive index of its material?
