Advertisements
Advertisements
Question
A simple microscope is used by watch repairers. Give reason.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to its principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and the size of the image.
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.
What happens when a ray of light falls normally (or perpendiculary) on the surface of a plane mirror?
Name the two types of spherical mirrors. What type of mirror is represented by the:
front side of a shining steel spoon?
Write the formula for a lens connecting image distance (v), object distance (u) and the focal length (f). How does the lens formula differ from the mirror formula?
A 2.0 cm tall object is placed 40 cm from a diverging lens of focal length 15 cm. Find the position and size of the image.
Write true or false
A virtual image formed by a spherical mirror is always erect and situated behind the mirror.
State the direction of incident ray which after reflection from a spherical mirror gets reflected along its own path. Give a reason.
Define the following terms in the context of spherical mirrors :
(i) Pole
(ii) Centre of curvature
(iii) Radius of curvature
(iv) Principal axis
Explain the following term:
Incident ray
Draw diagram/diagrams to show them.
How is the focal length of a spherical mirror related to its radius of curvature?
The magnification for a mirror is -3. How are u and v related?
The image formed by a convex mirror is of size one third the size of object. How are u and v related?
A point light source is kept in front of a convex mirror at a distance of 40 cm. The focal length of the mirror is 40 cm. Find the position of image.
Define the following term in relation to concave mirror.
Principal axis
Which of the following has curved reflecting surface?
A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
Name the two types of spherical mirrors.
