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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?
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उत्तर
- The combination forms a concave lens.
- XX' is known as the principal axis.
- complete diagram is drawn as
- The point F is called a focal point or focus.
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संबंधित प्रश्न
What is a lens?
In the following figure (a) and (b), F1 and F2 are positions of the two foci of thin lenses. Draw the path taken by the light ray AB after it emerges from each lens.
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| (a) |
 |
| (b) |
Study the diagram shown in Fig. 5.56
where is the object located?
Study the diagram shown in Fig. 5.56
Where is the image formed?
A ray of light incident parallel to the principal axis of a lens, passes undeviated after refraction.
State the condition of the following:
A lens has both its focal lengths equal.
How will you differentiate between a convex and a concave lens by looking at a distant object.
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.
