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प्रश्न
A simple microscope is used by watch repairers. Give reason.
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उत्तर
When an object is placed within the focal length of a simple microscope, its magnified and erect image is obtained on the same side of the lens as that of the object. So, a watch repairer sees the minute parts of a watch very clearly with a simple microscope by adjusting the distance between the object and the lens. This helps in repairing the watch. Hence, a simple microscope is used by watch repairers.
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संबंधित प्रश्न
Name the spherical mirror which has:
(a) virtual principal focus.
(b) real principal focus.
The diverging lens in part (a) is replaced by a converging lens also of focal length 100 mm. The object remains in the same position and an image is formed by the converging lens. Compare two properties of this image with those of the image formed by the diverging lens in part (a).
State the types of mirrors used for (i) headlights and (ii) rear view mirror, in cars and motorcycles. Give to justify your answer in each case.
Name the two kinds of spherical mirrors and distinguish between them.
How will you distinguish between a plane mirror, a concave mirror and a convex mirror, without touching them?
Upto what maximum distance from a concave mirror, the image can be obtained? What will be the location of object for it?
Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.
A concave mirror forms a real image of an object placed in front of it at a distance 30 cm, of size three times the size of object. Find
- the focal length of mirror
- position of image.
Select the correct option:
A mirror forms a virtual image (diminished) of an object, whatever be the position of object:
Define the following term in relation to concave mirror.
Radius of curvature
The following figure shows a concave mirror with its pole (P), focus (F), and center of curvature (C). Draw a ray diagram to show the formation of the image of an object AB by the concave mirror.
Define the term Centre of curvature.
Define the term Focus of a concave mirror.
An object is placed in front of a concave mirror as shown in the following figure. By scale drawing, find the nature of the image. Given f = 10 cm, v = 30 cm.
Complete the following diagrams shown in the below figure by drawing the reflected ray for each incident ray.
The spherical mirror used in a beauty parlour as make-up mirror is _______.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
How tall does a mirror have to be to fit an entire person’s body?
