Reflection of Light Science - Reflection of Light

Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be:

The figure given alongside shows the image of a clock as seen a plane mirror. The correct time is:
Figure.

If a magnification of, −1 (minus one) is to be obtained by using a converging mirror, then the object has to be placed:

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:

The image formed by a concave mirror is virtual, erect and magnified. The position of object is:

Fill in the following blanks with suitable words:For a convex mirror, parallel rays of light appear to diverge from a point called the ______ .

Fill in the following blank with a suitable word:
A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from ______ after reflection from the mirror.

Fill in the following blanks with suitable words:The focal length of a concave mirror is the distance from the ______ to the mirror.

Fill in the following blank with a suitable word:
When light is reflected, the angles of incidence and reflection are _____.

Fill in the following blanks with suitable words:Parallel rays of light are reflected by a concave mirror to a point called the _____.

State whether the following statement is true or false:
A diverging mirror is used as a rear-view mirror.

State whether the following statement is true or false:
A student says that we can see an object because light from our eyes is reflected back by the object

Draw a labelled ray diagram to show the formation of image in a convex mirror when the object is at infinity. Mark clearly the pole and focus of the mirror in the diagram.

The image seen in a plane mirror cannot be formed on a screen. What name is given to this type of image?

What sign (+ve or -ve) has been given to the following on the basis of Cartesian Sign Convention?

1. Height of a real image.
2. Height of a virtual image.

What kind of mirrors are used in big shopping centres to watch the activities of the customers?

State one use of concave mirror based on the formation of image as in case (z) above.

An object 1cm tall is placed 30cm in front of a convex mirror of focal length 20cm. Find the size and position of the image formed by the convex mirror.

An object is placed just outside the principal focus of concave mirror. Draw a ray diagram to show how the image is formed, and describe its size, position and nature.

Draw a diagram to represent a convex mirror. On this diagram mark principal axis, principal focus F and the centre of curvature C if the focal length of convex mirror is 3cm.

Explain why, a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.

An object is placed at a distance of 6cm from a convex mirror of focal length 12cm. Find the position and nature of the image.

A diverging mirror of radius of curvature 40cm forms an image which is half the height of the object. Find the object and image positions.

The radius of curvature of a convex mirror used as a rear view mirror in a moving car is 2.0m. A truck is coming from behind it at a distance of 3.5m. Calculate (a) position, and (b) size, of the image relative to the size of the truck. What will be the nature of the image?

Which of the following are concave mirrors and which convex mirrors?
Shaving mirrors, Car headlight mirror, Searchlight mirror, Driving mirror, Dentist’s inspection mirror, Torch mirror, Staircase mirror in a double-decker bus, Make-up mirror, Solar furnace mirror, Satellite TV dish, Shop security mirror.

What is a spherical mirror? Distinguish between a concave mirror and a convex mirror.

A man holds a spherical shaving mirror of radius of curvature 60cm, and focal length 30cm, at a distance of 15cm, from his nose. Find the position of image, and calculate the magnification.

An object is placed 15cm from (a) a converging mirror, and (b) a diverging mirror, of radius of curvature 20cm. Calculate the image position and magnification in each case.

If a concave mirror has a focal length of 10cm, find the two positions where an object can be placed to give, in each case, an image twice the height of the object.

An object is placed (a) 20cm, (b) 4cm, in front of a concave mirror of focal length 12cm. Find the nature and position of the image formed in each case.

At what distance from a concave mirror of focal length 10cm should an object be placed so that:

1. Its real image is formed 20cm from the mirror?
2. Its virtual image is formed 20cm from the mirror?

The diagram shows a dish antenna which is used to receive television signals from a satellite. The antenna (signal detector) is fixed in front of the curved dish.

1. What is the purpose of the dish?
2. Should it be concave or convex?
3. Where should the antenna be positioned to receive the strongest possible signals?
4. Explain what change you would expect in the signals if a larger dish was used.

Whatever be the position of the object, the image formed by a mirror is virtual, erect and smaller than the object. The mirror then must be:

1. Plane.
2. Concave.
3. Convex.
4. Either concave or convex.

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he find that the size of his face in mirror A goes on increasing but that in mirror B remains the same.

1. Mirror A is concave and mirror B is convex.
2. Mirror A is plane and mirror B is concave.
3. Mirror A is concave and mirror B is plane.
4. Mirror A is convex and mirror B is concave.

The real image formed by a concave mirror is smaller than the object if the object is:

1. Between centre of curvature and focus.
2. At a distance greater than radius of curvature.
3. At a distance equal to radius of curvature.
4. At a distance equal to focal length.

The real image formed by a concave mirror is larger than the object when object is:

1. At a distance equal to radius of curvature.
2. At a distance less than the focal length.
3. Between focus and centre of curvature.
4. At a distance greater than radius of curvature.

The mirror which can form a magnified image of an object is:

1. Convex mirror.
2. Plane mirror.
3. Concave mirror.
4. Both convex and concave mirror.

Fill in the following blank with a suitable word:
When light is reflected, the angles of incidence and reflection are _____.

Fill in the following blank with a suitable word:
A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from ______ after reflection from the mirror.

Fill in the following blanks with suitable words:

The focal length of a concave mirror is the distance from the ______ to the mirror.

Fill in the following blanks with suitable words:

Parallel rays of light are reflected by a concave mirror to a point called the _____.

Fill in the following blanks with suitable words:

For a convex mirror, parallel rays of light appear to diverge from a point called the ______ .

State whether the following statement is true or false:
A student says that we can see an object because light from our eyes is reflected back by the object

State whether the following statement is true or false:
A diverging mirror is used as a rear-view mirror.

Write the mirror formula. Give the meaning of each symbol which occurs in it.

Which type of reflection of light leads to the formation of images?

Which type of mirror is usually used as a rear-view mirror in motor cars?

Which type of mirror has:

1. Positive focal length?
2. Negative focal length?

Which type of mirror could be used as a dentist’s mirror?

Write the word AMBULANCE as it would appear when reflected in a plane mirror. Why is it sometimes written in this way (as its mirror image) on the front of an ambulance?

Write down a formula for the magnification produced by a concave mirror.

1. In terms of height of object and height of image.
2. In terms of object distance and image distance.

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.

With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.

Why does a driver prefer to use a convex mirror as a rear-view mirror in a vehicle?

Which of the following are concave mirrors and which convex mirrors?
Shaving mirrors, Car headlight mirror, Searchlight mirror, Driving mirror, Dentist’s inspection mirror, Torch mirror, Staircase mirror in a double-decker bus, Make-up mirror, Solar furnace mirror, Satellite TV dish, Shop security mirror.

Which mirror is used as a torch reflector? Draw a labelled diagram to show how a torch reflector can be used to produce a parallel beam of light. Where is the bulb placed in relation to the torch reflector?

When an object is placed 20cm from a concave mirror, a real image magnified three times is formed. Find:

1. The focal length of the mirror.
2. Where must the object be placed to give a virtual image three times the height of the object?

What would your image look like if you stood dose to a large:

1. Convex mirror?
2. Concave mirror?

Give reasons for your answer.

Write all the capital letters of the alphabet which look the same in a plane mirror.

With the help of a labelled ray-diagram, describe how a plane mirror forms an image of a point source of light placed in front of it. State the characteristics of the image formed in a plane mirror.

When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.

1. What is the nature of spherical mirror?
2. Why is a hole burnt in the carbon paper?
3. At which point of the spherical mirror the carbon paper is placed?
4. What name is given to the distance between spherical mirror and carbon paper?
5. What is the advantage of using a carbon paper rather than a white paper?

What is meant by ‘reflection of light’? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram :

1. Incident ray.
2. Point of incidence.
3. Normal.
4. Reflected ray.
5. Angle of incidence.
6. Angle of reflection.

The image in a plane mirror is virtual and laterally inverted. What does this statement mean?