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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
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option)
(A) Convex lens of focal length 10 cm.
(B) Convex lens of radius of curvature 20 cm.
(C) Convex lens of focal length 20 cm.
(D) Concave mirror of focal length 20 cm.
Name the spherical mirror which can produce a real and diminished image of an object.
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
How is the focal length of a spherical mirror related to its radius
Which are the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain with the help of suitable ray diagrams.
Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.
State the two convenient rays that are chosen to construct the image by a spherical mirror for a given object? Explain your answer with the help of suitable ray diagrams.
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.
Define the following term in relation to concave mirror.
Center of curvature
Find the height of the image of a body of height 1.5m in a mirror with a magnification of 1.5.
Define the term Principle focus.
A concave mirror can be used to produce a parallel beam of light. Draw a ray to illustrate this.
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.
Which of the following has curved reflecting surface?
The spherical mirror used as a rear view mirror in the vehicle is
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
Name the type of mirror used in the following situation:
Side/rear-view mirror of a vehicle
Support your answer with reason.
In normal adjustment, for a refracting telescope, the distance between objective and eye piece is 30 cm. The focal length of the objective, when the angular magnification of the telescope is 2, will be ______.
