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प्रश्न
Which lens has more power a thick lens or a thin lens?
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उत्तर
A thick lens has more power than a thin lens. This is because a thick lens has a larger surface curvature. It has a short focal length and that is why it deviates the rays of light at a greater extent.
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संबंधित प्रश्न
Consider two statements A and B given below:
A: real image is always inverted
B: virtual image is always erect
Out of these two statements:
How is the power of a lens related to its focal length?
What do you understand by the power of a lens?
Define the term focal length of a lens.
State the condition for the following a ray passes undeviated through the lens .
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 lens forms an upright and diminished image of an object, irrespective of its position. What kind of lens is this? Draw an outline ray diagram to show the formation of the image. State the position and one more characteristic of the image.
A stick partly immersed in water appears to be bent. Draw a ray diagram to show the bending of the stick when placed in water and viewed obliquely from above.
The power of lens depends on the focal length of the 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.
