Light MCQ Quiz-Class 10 » Chemistry-Papers

A boy is standing at a distance of 3 m in front of a plane mirror. If the boy moves 1 m backward, the distance between the image and the boy is

2 m

3 m

4 m

A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image?

1.5 m

3 m

6 m

Magnification produced by a plane mirror

greater than one

equal to one

less than one

When an object is placed between the focus and the pole of a concave mirror, the image formed is

real, inverted and same

virtual, erect and enlarged

real, inverted and small

The focal length of the plane mirror is:

10 cm

zero

Infinity

25 cm

A ray passing through the focus and falling on a convex lens will:

will emerge perpendicular to the principal axis

will emerge parallel to the principal axis

If the magnification of mirror has a plus sign then the image is and _.

real and inverted

virtual and erect

If parallel beams, non-parallel to principal axis fall on the convex lens, they converge at a point:

away from principal axis

called focus on the axis

Linear magnification produced by a concave mirror may be

less than 1, more than 1 or equal to 1

more than 1 or equal to 1

less than 1 or equal to 1

A convex lens is:

Called a diverging lens.

Called a converging lens.

The mirror used by dentists to concentrate light on the tooth to be examined is a

concave mirror

plane mirror

convex mirror

For concave mirror, What will be the position of the image if the object is placed at infinity?

At the focus F

Between F and C

When the object is at focus of a concave mirror, the image is formed at

infinity

focus

centre of curvature

An object of size 3.0 cm is kept perpendicular to the principal axis of a concave mirror. The distance of the object from the pole of the mirror equals the radius of curvature of the mirror. The size of the image formed is:

3.0 cm

2.5 cm

1.5 cm

The Refractive index of water is _____

1.33

1.2

2.3

1.5

When a ray of light goes from one medium to another, there is:

A change in direction but constant speed.

No change in speed and but not direction.

Always a change in its speed as well as direction.

The ratio of the height of an image to the height of an object known as

magnification

lateral displacement

For an image to be the same size as the object in case of concave mirror, what will be the position of the object?

At Centre of curvature

At focus

The nature of the image formed by a mirror is not affected by the position of the object. The mirror is:

Either a plane mirror or a convex mirror

Plane mirror

Convex mirror

The power of a lens is -4.0 D. What is the nature of the lens?

Plano convex

Concave

convex

A dentist uses a small mirror that gives a magnification of 4 when it is held 0.60 cm from a tooth. The radius of curvature of the mirror is

1.60 cm (concave)

1.60 cm (convex)

A virtual image larger than the object can be produced by a

convex mirror

concave mirror

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

At the centre of curvature

Between the pole of the mirror and its principal focus.

Between the principal focus and the centre of curvature

The unit of magnification is

none of these

When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. The nature of the image is

real, inverted

virtual and inverted

virtual and erect

An object 4 cm light is placed at a distance of 15 cm in front of a convex mirror having a radius of curvature of 10 cm. Then the image found is at a distance of

3.75 cm behind the mirror

3.75 cm in front of the mirror

A convex mirror has a focal length 15 cm. A real object placed at a distance 15 cm in front of it from the pole, produces an image at

30 cm

7.5 cm

The image of a distant object is obtained on a screen by using a concave mirror. The focal length of the mirror can be determined by measuring the distance between

the mirror and the screen

the object and the screen

In case of a real and inverted image, the magnification of a mirror is

negative

positive

Name the type of image that can be obtained on a screen.

Real

Undefined

Virtual

The Refractive index of quartz is ___than/to alcohol.

less

equal

In case of a virtual and erect image, the magnification of a mirror is

negative

positive

unity

Virtual, erect, and diminished image are the characteristic features of a:

Biconvex mirror

Convex mirror

Biconcave mirror

Concave mirror

Which type of mirror is used in ophthalmoscope to examine throat and ear?

Concave

Convex

Plane mirror

In order to have a very wide field of view, the mirror used in cars is

convex

concave

If a mirror has a focal length of –20 cm, it is a

convex mirror

concave mirror

A spherical mirror and a thin lens have each a focal length of – 20 cm

both are concave

both are convex

If the image formed behind a concave mirror what will be the nature of the image?

Both Virtual and Erect

Virtual

Erect

A boy is standing at a distance of 3 m in front of a plane mirror. If the boy moves 1 m backward, the distance between the image and the boy is

A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image?

Magnification produced by a plane mirror

When an object is placed between the focus and the pole of a concave mirror, the image formed is

The focal length of the plane mirror is:

A ray passing through the focus and falling on a convex lens will:

If the magnification of mirror has a plus sign then the image is ____and _____.

If parallel beams, non-parallel to principal axis fall on the convex lens, they converge at a point:

Linear magnification produced by a concave mirror may be

A convex lens is:

The mirror used by dentists to concentrate light on the tooth to be examined is a

For concave mirror, What will be the position of the image if the object is placed at infinity?

When the object is at focus of a concave mirror, the image is formed at

An object of size 3.0 cm is kept perpendicular to the principal axis of a concave mirror. The distance of the object from the pole of the mirror equals the radius of curvature of the mirror. The size of the image formed is:

The Refractive index of water is _____

When a ray of light goes from one medium to another, there is:

The ratio of the height of an image to the height of an object known as

For an image to be the same size as the object in case of concave mirror, what will be the position of the object?

The nature of the image formed by a mirror is not affected by the position of the object. The mirror is:

The power of a lens is -4.0 D. What is the nature of the lens?

A dentist uses a small mirror that gives a magnification of 4 when it is held 0.60 cm from a tooth. The radius of curvature of the mirror is

A virtual image larger than the object can be produced by a

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object?

The unit of magnification is

When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. The nature of the image is

An object 4 cm light is placed at a distance of 15 cm in front of a convex mirror having a radius of curvature of 10 cm. Then the image found is at a distance of

A convex mirror has a focal length 15 cm. A real object placed at a distance 15 cm in front of it from the pole, produces an image at

The image of a distant object is obtained on a screen by using a concave mirror. The focal length of the mirror can be determined by measuring the distance between

In case of a real and inverted image, the magnification of a mirror is

Name the type of image that can be obtained on a screen.

The Refractive index of quartz is ___than/to alcohol.

In case of a virtual and erect image, the magnification of a mirror is

Virtual, erect, and diminished image are the characteristic features of a:

Which type of mirror is used in ophthalmoscope to examine throat and ear?

In order to have a very wide field of view, the mirror used in cars is

If a mirror has a focal length of –20 cm, it is a

A spherical mirror and a thin lens have each a focal length of – 20 cm

If the image formed behind a concave mirror what will be the nature of the image?

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If the magnification of mirror has a plus sign then the image is and _.