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प्रश्न
The lens of power + 1·0 D is ______.
विकल्प
Convex of focal length 1·0 cm
Convex of focal length 1·0 m
Concave of focal length 1·0 cm
Concave of focal length 1·0 m.
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उत्तर
The lens of power + 1·0 D is convex of focal length 1·0 m.
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संबंधित प्रश्न
Calculate the focal length of a corrective lens having power +2.5 D.
What do you understand by the power of a lens? Name one factor on which the power of a lens depends.
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State the condition for the following a lens has both its focal lengths equal .
On reducing the focal length of a lens, its power ______.
A thin converging lens is formed with one surface convex and the other plane. Does the position of image depend on whether the convex surface or the plane surface faces the object?
The power of lens depends on the focal length of the lens
Assertion and reasoning type
- Assertion: Myopia is due to the increase in the converging power of eye lens.
- Reason: Myopia can be corrected with the help of concave lens.
The above lens has a focal length of 10 cm. The object of height 2 mm is placed at a distance of 5 cm from the pole. Find the height of the image.
