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प्रश्न
State the nature and position of the object on the principal axis to obtain a real image of the same size
उत्तर
Lens is convex; object to be placed at 2F.
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संबंधित प्रश्न
To find the image-distance for varying object-distances in case of a convex lens, a student obtains on a screen a sharp image of a bright object placed very far from the lens. After that he gradually moves the object towards the lens and each time focuses its image of the screen.
(a) In which direction – towards or away from the lens, does he move the screen to focus the object?
(b) What happens to the size of image – does it increase or decrease?
(c) What happen when he moves the object very close to the lens?
Which of the following lenses would you prefer to use while reading small letters found in a dictionary?
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and the nature of the image formed.
Write one condition where it does not bend when entering a medium of different optical density.
Draw a labelled ray diagram to show how a ray of light passes through a parallel sided glass block:
if it hits the glass block at an angle other than 90° (that is, obliquely to the glass block).
Distinguish between a convex lens and concave lens. Which of the two is a converging lens : convex lens of concave lens?
What type of lens is shown in the diagram on the right? What will happen to the parallel rays of light? Show by completing the ray diagram.
What kind of lens can form:
an erect magnified image?
Can one bum a piece of paper in daylight by just using a convex lens instead of a match or any direct flame? Support your answer with the help of an appropriate ray diagram.
Distinguish between Concave lens and Convex Lens.
