Image Formation by Spherical Mirrors
Trending Questions
A concave mirror produces three times magnified (enlarged) real image of an object placed at in front of it. Where is the image located?
An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of a focal length of 18 cm. At what distance from the mirror should a screen be placed so that a sharply focused image can be obtained? Find the size and the nature of the image.
A convex mirror used on automobile has 3 m radius of curvature. If a bus is located at 5m from this mirror, find the position and size of the image
An object is placed 18 cm in front of a spherical mirror. If the image is formed at 4 cm to the right of the mirror then calculate its focal length. Is the mirror concave or convex. What is the nature of the image. What is the radius of curvature?
How will you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them ?
Why does a driver prefer to use a convex mirror as a rear-view mirror in a vehicle ?
Explain with a suitable diagram, how a concave mirror converges a parallel beam of light rays. Mark clearly the pole, focus and centre of curvature of concave mirror in this diagram.
The expression for the magnification of a spherical mirror in terms of focal length (f) and the distance of the object from mirror (u) is :
f /(u-f)
f/ (u+f)
-f/ (u+f)
-f/ (u-f)
An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of a focal length of 15.0 cm.
(i) At what distance from the mirror should a screen be placed in order to obtain a sharp image?
(ii) Find the size of the image.
(iii) Draw a ray diagram to show the formation of the image in this case.
When an object is at infinity from a concave mirror, the image formed is
at the centre of curvature of the mirror.
anywhere beyond the centre of curvature of the mirror.
between the centre of curvature and the focus of the mirror
at the focus of the mirror.
What is the relationship between magnification and focal length of a spherical mirror
What type of mirror is used in solar cookers and why?
Question 2
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) -30 cm
(b) -20 cm
(c) -40 cm
(d) -60 cm
An object is placed at the following distances from a concave mirror of focal length 15 cm, turn by turn : (a) 35 cm (b) 30 cm (c) 20 cm (d) 10 cm Which position of the object will produce : (i) a magnified real image ? (ii) a magnified virtual image ? (iii) a diminished real image ? (iv) an image of same size as the object ?
Question 34
Draw ray diagrams showing the image formation by a convex mirror when an object is placed
(a) at infinity
(b) at finite distance from the mirror
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.
A spherical mirror and a spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be : (a) both concave. (b) both convex. (c) the mirror is concave but the lens is convex. (d) the mirror is convex but the lens is concave.
The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object must then be : (a) at the focus (b) between the centre of curvature and focus (c) at the centre of curvature (d) beyond the centre of curvature
Identify the device used as a spherical mirror or lens in following cases, when the image formed is virtual and erect in each case.
(a) Object is placed between device and its focus, image formed is enlarged and behind it.
(b) Object is placed between the focus and device, image formed is enlarged and on the same side as that of the object.
(c) Object is placed between infinity and device, image formed is diminished and between focus and optical centre on the same side as that of the object.
(d) Object is placed between infinity and device, image formed is diminished and between pole and focus, behind it.Between which two points of a concave mirror should an object be placed to obtain a magnification of 3?
Why can you not use a concave mirror as a rear-view mirror in vehicles ?
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of carbon paper for some time, a hole is burnt in the carbon paper.
(a) What is the nature of spherical mirror?
(b) Why is a hole burnt in the carbon paper?
(c) At which point of the spherical mirror the carbon paper is placed?
(d) What name is given to the distance between spherical mirror and carbon paper?
(e) What is the advantage of using a carbon paper rather than a white paper?
With the help of a ray diagram, determine the position, nature and size of the image formed of an object placed at the centre of curvature of a concave mirror.
Name the mirror which can give : (a) an erect and enlarged image of an object. (b) an erect and diminished image of an object.
The image formed by a concave mirror is virtual, erect and magnified. The position of object is : (a) at focus (b) between focus and centre of curvature (c) at pole (d) between pole and focus
Where would the image be formed by a convex mirror if the object is placed :
(a) between infinity and pole of the mirror ?
(b) at infinity ? Draw labelled ray-diagrams to show the formation of image in both the cases.
Draw a ray diagram showing how a concave mirror can be used to produce a real, inverted and diminished Image of an object.
The mirror which can form a magnified image of an object is : (a) convex mirror (b) plane mirror (c) concave mirror (d) both convex and concave mirrors
For what position of an object, a concave mirror forms a real image equal in size to the object?
Why do we see inverted images in a spoon?
