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प्रश्न
Which part causes the greatest convergence?
उत्तर
The cornea is the part of the eye that causes the greatest convergence because light first enters the eye through the cornea, which is convex.
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संबंधित प्रश्न
A student is using a convex lens of focal length 18 cm to study the image formation by it for the various positions of the object. He observes that when he places the object at 27 cm, the location of the image is at 54 cm on the other side of the lens. Identify from the following diagram the three rays that are obeying the laws of refraction and may be used to draw the corresponding ray diagram.
(A) 1, 2 and 4
(B) 1, 3 and 5
(C) 2, 4 and 5
(D) 2, 3 and 4
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?
Draw a ray diagram to show the formation of the image of an object be placed so that a real and inverted image of the same size as the object is obtained using a convex lens
Define principal axis, principal focus and focal length of a convex lens.
List some things that convex lens and concave mirror have in common.
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?
A lens forms an upright and magnified image of an object. Name the lens.
A lens forms an upright and magnified image of an object State whether the image is real or virtual
State the position of object, position of image, nature of image when: Convex lens is used as in searchlight.
Draw a ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror.
