Advertisements
Advertisements
Question
A student wants to obtain an erect image of an object using a concave mirror of 10 cm focal length. What will be the distance of the object from mirror?
Options
Less than 10 cm
10 cm
between 10 cm and 20 cm
more than 20 cm
Solution
Less than 10 cm
Explanation:
Only when the object is positioned between the pole and the focus can a concave mirror produce an upright image.
Distance between pole and focus = Focal length = 10 cm
As a result, the object can be placed less than 10 cm from the mirror. As a result, the image created when an object is put between the pole and the focus. The virtual, upright, and expanded concave mirror.
APPEARS IN
RELATED QUESTIONS
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should the position of the object be relative to the mirror? Draw ray diagram to justify your answer.
What is the minimum number of rays required for locating the image formed by a concave mirror for an object? Draw a ray diagram to show the formation of a virtual image by a concave mirror.
In the concave reflector of a torch, the bulb is placed:
(a) between the pole and focus of reflector
(b) at the focus of reflector
(c) between focus and centre of curvature of reflector
(d) at the centre of curvature of reflector
An object 3 cm high is placed at a distance of 8 cm from a concave mirror which produces a virtual image 4.5 cm high:
(i) What is the focal length of the mirror?
(ii) What is the position of image?
(iii) Draw a ray-diagram to show the formation of image.
How far should an object be placed from the pole of a converging mirror of focal length 20cm to form a real image of the size exactly `1/4`th the size of the object?
Between which two points of concave mirror should an object be placed to obtain a magnification of:
(a) −3
(b) +25
(c) −0.4
With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram.
A convex mirror is used as a shaving mirror.
In which equipment/s do you find ___________________
An object at a distance of 30 cm from a
concave mirror gets its image at the same point. The focal length of the mirror is ______.
