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प्रश्न
Increase in the converging power of eye lens cause ‘hypermetropia'
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
Define the power of a lens.
A converging lens has focal length of 50 mm. What is the power of the lens?
A lens has a focal length of, −10 cm. What is the power of the lens and what is its nature?
The power of a lens is +2.0D. Its focal length should be :
How does the power of a lens change if its focal length is doubled?
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.
A pin of length 2.00 cm is placed perpendicular to the principal axis of a converging lens. An inverted image of size 1.00 cm is formed at a distance of 40.0 cm from the pin. Find the focal length of the lens and its distance from the pin.
Which lens has more power a thick lens or a thin lens?
If focal length of a convex lens is 20 cm at what is the power of the lens?
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?
