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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
Define 1 dioptre of power of a lens.
Name the physical quantity whose unit is dioptre.
What is the power of a convex lens lens whose focal length is 80 cm?
What is the nature of a lens having a power of + 0.5 D?
The power of a combination of two lenses X and Y is 5 D. If the focal length of lens X be 15 cm :
(a) calculate the focal length of lens Y.
(b) state the nature of lens Y.
The power of a lens is + 1.0 D is :
Consider three converging lenses L1, L2 and L3 having identical geometrical construction. The index of refraction of L1 and L2 are \[\mu_1 \text{ and } \mu_2\] respectively. The upper half of the lens L3 has a refractive index \[\mu_1\] and the lower half has \[\mu_2\] following figure . A point object O is imaged at O1 by the lens L1 and at O2 by the lens L2placed in same position. If L3 is placed at the same place,
(a) there will be an image at O1
(b) there will be an image at O2.
(c) the only image will form somewhere between O1 and O2
(d) the only image will form away from O2.
Consider the situation described in the previous problem. Where should a point source be placed on the principal axis so that the two images form at the same place?
The power of a lens is +2.0 D. Find its focal length and state the kind of lens.
An object is kept at a distance of 1m from a lens of power +2D:
- Identify the type of lens.
- Calculate its focal length and distance of the image formed.
