Image Formation by Spherical Mirrors

Q.

Draw ray diagrams showing the image formation by a convex mirror when an object is placed at infinity.

Q.

Draw a ray diagram to show the formation of image of an object kept in front of a convex mirror. State three characteristics of the image.

Q.

Name the mirror which always produce an erect and virtual image. How is the size of image related to the size of object ?

Q.

Discuss the position and nature of image formed by a convex mirror when an object is moved from infinity towards the pole of mirror.

Q.

A real and enlarged image can be obtained by using a :

(a) convex mirror

(b) plane mirror

(c) concave mirror

(d) either convex or plane mirror.

Q.

The image formed by a convex mirror is:

(a) erect and diminished

(b) erect and enlarged

(c) inverted and diminished

(d) inverted and enlarged.

Q.

For an incident ray directed towards centre of curvature of a spherical mirror, the reflected ray :

(a) retraces its path

(b) passes through the focus

(c) passes through the pole

(d) becomes parallel to the principal axis.

Q.

State the direction of the incident ray which after reflection from a spherical mirror retraces its path. Give a reason for your answer.

Q.

An inverted image can be seen by using a convex mirror under what circumstances?

1. Under no circumstances

2. When the object is placed at infinity

3. When the distance of the object from the mirror is equal to the focal length of the mirror.

4. When the object is placed at infinity

Q.

Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.

Q.

Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.

Q.

Upto what maximum distance from a concave mirror, the image can be obtained ? What will be the location of object for it ?

Q.

1. What is the focal length of a plane mirror?
2. What is the magnification of a plane mirror?
3. What is meant by the power of a lens?
4. What is one dioptre?
5. We know that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain. [5 MARKS]

Q.

A ray of light is incident on the pole of a concave mirror at an angle of 50^o. At what angle will it reflect?

1. 0^o

2. 180^o

3. 90^o

4. 50^o

Q.

(a) What is a real image?

(b) What type of mirror can be used to obtain a real image of an object?

(c) Does the mirror mentioned in part (b) form real image for all locations of the object?

Q.

At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to size of the object.

Q.

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.

Q.

(a) State the position of object for which the image formed by a concave mirror is of same size.

(b) Write two more characteristics of the image.

Q.

Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.

Q.

Assume the distance between sun and mirror is infinity and the sun is much above the principal axis. Where will the image of the sun be formed?

1. at f

2. in focal plane but below principal axis

3. in focal plane but above principal axis

4. at R

Q.

Upto what maximum distance from the pole the image in a convex mirror can be obtained ? What will be the location of object then ?

Q.

(i) Name the mirrors shown in figure (a) and (b).

(ii) In each case (a) and (b), draw the reflected rays for the given incident rays and mark focus by the symbol F.

Q.

Ray of light falling parallel to the principal axis follows which path after reflection?

1. 1

2. 2

3. 4

4. 3

Q.

(a) For what position of object, the image formed by a concave mirror is magnified and erect ?

(b) State whether the image in part (a) is real or virtual ?

Q. Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.

Q.

How high temperature is achieved in solar cooker by the use of mirrors?

1. Mirrors are used to reflect sunlight on the cooker thus more heat.

2. Mirrors diffuse light in all direction.

3. None of these.

4. Mirrors absorb more sunlight falling on the cooker thus more heat.

Q. The angle of incidence is always equal to the angle of reflection.

1. True
2. False

Q. Real image can be obtained on a screen.

1. True
2. False

Q. In a concave mirror, when the object is at infinity, its image forms at

1. infinity
2. the focus
3. the Pole
4. the centre of curvature

Q. The Laws of reflection are true for:

1. Any reflecting surface
2. Concave mirrors only
3. Convex mirrors only
4. Plane mirrors only