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प्रश्न
If an object is placed in front of a convex lens beyond 2F1, then what will be the position, relative size, and nature of an image which is formed? Explain with a ray diagram.
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उत्तर
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संबंधित प्रश्न
A beam of light travelling in air is incident of water. Draw a ray-diagram indicating the change in its path in water.
If an object is placed at the focus of a convex lens, where is the image formed?
Where should an object be placed in order to use a convex lens as a magnifying glass?
What type of images can a convex lens make?
What kind of lens can form:
an erect magnified image?
A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens.
- At what distance from the film should the lens be adjusted to obtain a sharp image of the flower?
- What would be the diameter of the image of the flower on the film?
- What is the nature of camera lens?
Which causes more bending (or more refraction) of light rays passing through it : a convex lens of long focal length or a convex lens of short focal length?
The focal lengths of four convex lenses P, Q, R and S are 20 cm, 15 cm, 5 cm and 10 cm, respectively. The lens having the greatest power is:
What kind of lens is used to correct
long-sightedness?
Where is the image formed?
In the following cases, where must an object be placed in front of a convex lens so that the image formed is inverted and enlarged?
To find the image distance for varying object distances in case of a convex lens of focal length 15 cm, a student obtains on a screen a sharp image of a bright object by placing it at 20 cm distance from the lens. After that he gradually moves the object away from the lens and each time focuses the image on the screen.
(a) In which direction-towards or away from the lens does he move the screen to focus the object?
(b) How does the size of image change?
(c) Approximately at what distance does he obtain the image of magnification –1?
(d) How does the intensity of image change as the object moves farther and farther away from the lens?
The image obtained while finding the focal length of convex lens is ....................
Observe the following figure and answer the questions.
a) Which optical instrument shows arrangement of lenses as shown in the figure?
b) Write in brief the working of this optical instrument.
c) How can we get different magnifications in this optical instrument?
d) Draw the figure again and labelled it properly
State the position of object, position of image, nature of image when: Convex lens is used in cine projector.
Which of the following statements is true?
Distinguish between Concave lens and Convex Lens.
Distinguish between:
Concave lens and Convex lens
Distinguish between:
Concave lens and Convex lens
