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प्रश्न
A lens forms the image of an object placed at a distance of 45 cm from it on a screen placed at a distance 90 cm on the other side of it. Name the kind of lens.
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उत्तर
As the image is formed on the other side of the lens, the image is real. Hence, the lens is a convex lens.
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संबंधित प्रश्न
The diagram below shows a lens as a combination of a glass slab and two prisms.
- Name the lens formed by the combination.
- What is the line XX’ called?
- Complete the path of the incident ray AB after passing through the lens.
- The final emergent ray either meets XX’ at a point or appears to come from a point on XX’. Label it as F. What is this point called?
The diagram given below shows the position of an object OA in relation to a converging lens whose foci are at F1 and F2.
Describe how the distance of the image from the lens and the size of the image change as the object is moved towards F1.
A ray of light incident at the optical centre of lens, passes undeviated after refraction.
State the condition of the following:
A ray passes undeviated through the lens.
Fig shows an object PQ placed on the principle axis of a lens L. The two foci of the kens are F1 and f2. The image formed by the lens is erect, Virtual and dimnished.
(i) Draw the outline ofthe lens L used and Named it.
(ii) Draw a ray of light starting from Q and passing through O. show the same ray after refraction by the lens.
(iii) Draw another ray from Q Which is incident parallel to the principle axis and show how it emerges after refraction from the lens.
(iv) Locate the final image formed.
What type of lenses are used in spectacles worn by an old lady for knitting?
How will you differentiate between a convex and a concave lens by looking at a printed page?
Name the subjective property of light related to its wavelength.
When does a ray of light falling on a lens pass through it undeviated?
