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प्रश्न
What is a lens?
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उत्तर
A lens is a transparent refracting medium bounded by two curved surfaces which are generally spherical.
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?
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 at the optical centre of lens, passes undeviated after refraction.
State the condition of the following:
A lens has both its focal lengths equal.
What type of lenses are used in spectacles worn by an old lady for knitting?
In the following diagram , the object and the image formed by the respective lenses are shown. Complete the ray diagram, and locate the focus. Find the focal length of the lens.
Define the term focus of a lens.
Complete the following diagram and state what happens to the ray of light after refraction through the lens.
Complete the following diagram and state what happens to the ray of light after refraction through the lens.
