The process of getting a sharp and clear image of an object is called :

screening

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parallax

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focussing

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none of these

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Solution

The correct option is D focussing
The process of getting a sharp and clear image of an object from an optical device is called focussing. In a simple microscope, focussing is done by adjusting the position of both objective and eyepiece. Objective lens is used for coarse focussing and eyepiece is used for soft focussing.

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Similar questions

Q. An object of size (height)

7 c m

is placed at

25 c m

in front of concave mirror of focal length

15 c m

. At what distance from the mirror should a screen be placed, so that we can get a sharp and clear image? Find nature and size (height) of the image.

Solve:

(1) An object of size 7 cm is placed at 25 cm in front of concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed, so that we can get a sharp and clear image. Find nature and size of the image.

(2) An object of height 5 cm is held 20 cm away from converging lens of focal length 10 cm. Find the position, nature and size of the image formed.

(3) An object is placed at a distance of 10 cm from a convex lens of focal length 12 cm. Find the position and nature of the image.

Q. An instrument which makes a big and clear image of small objects.

Q. An object is placed

30 c m

away from a convex lens of focal length

10 c m

and a sharp image is formed on a screen. Now a concave lens is placed in contact with the convex lens. The screen now has to be moved by

45 c m

to get a sharp image again. The magnitude of focal length of the concave lens is (in

c m

Q. An object of 5.0 cm size is placed at a distance of 20.0 cm from a converging mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed to get the sharp image? Also calculate the size of the image.

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