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Question
State the condition of the following:
A ray passes undeviated through the lens.
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Solution
A ray of light passing through the optical centre of the lens passes undeviated.
RELATED QUESTIONS
What is a lens?
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?
For an object placed at a distance 20 cm in front of a convex lens, the image is at a distance 20 cm behind the lens. The focal length of the convex lens is ______.
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.
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.
In fig., a real image of a point objert O is formed, Which of the following statements is true about each of the arrangements?
- The object is at the principle focus of the lens.
- The focal length of the lens is 17 cm.
- If the mirror is moved so that it is 6 cm from the lens image will also move.
Make the correct choices in the following items:
lf the image can be focused on a screen it must be
State the nature and position of the object on the principal axis to obtain a real and magnified image.
When does a ray of light falling on a lens pass through it undeviated?
Draw a ray diagram to show the image formed by a convex lens when the object is placed between F and 2F.
