Physics
A ray diagram for a convex lens is shown below. In this manner, a convex lens is used in :
- camera
- cinema
- burning glass
- terrestrial telescope
Refraction Lens
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Answer
terrestrial telescope
Reason — The image formed in the above case will be real, inverted and of the same size as object hence, it is used in terrestrial telescope for erecting the inverted images formed by the objective lens.
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Related Questions
Which of the ray diagrams are correct ?
1.
2.
3.
4.
Identify the incorrect statement :
- A real image is formed due to actual intersection of the rays refracted by the lens.
- A virtual image can be obtained on the screen.
- A virtual image is erect with respect to the object.
- A real image is inverted with respect to the object.
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:
- 20 cm
- 10 cm
- 15 cm
- 40 cm.
For the object placed between the optical centre and focus of a convex lens, the image is :
- real and enlarged
- real and diminished
- virtual and enlarged
- virtual and diminished