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
Name the two types of spherical mirrors. What type of mirror is represented by the:
- back side of a shining steel spoon?
- front side of a shining steel spoon?
Name the spherical mirror which can produce a virtual and diminished image of an object.
- A small object is placed 150 mm away from a diverging lens of focal length 100 mm.
- Copy the figure below and draw rays to show how an image is formed by the lens.

- Calculate the distance of the image from the lens by using the lens formula.
- Copy the figure below and draw rays to show how an image is formed by the lens.
- 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).
The letters on the front of an ambulance are written laterally inverted like
. Give reason.
Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.
An object of length 4 cm is placed in front of a concave mirror at distance 30 cm. The focal length of mirror is 15 cm.
- Where will the image form?
- What will be the length of image?
When an object of height 1 cm is kept at a distance 4 cm from a concave mirror, its erect image of height 1.5 cm is formed at a distance 6 cm behind the mirror. Find the focal length of mirror, by drawing.
Select the correct option:
A concave mirror is made by cutting a portion of a hollow glass sphere of radius 30 cm. The focal length of the concave mirror is:
Select the correct option:
Looking into a mirror one finds her image diminished, the mirror is:
Select the correct option:
Which mirror is used in periscope?
In the following figure shows a concave mirror with its pole (P), focus (F) and centre 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.
Draw a ray diagram to show that a convex mirror has a wider field of view.
Spherical mirrors are one form of ______ mirrors.
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
Define the radius of curvature.
