Light MCQ Quiz-Class 10 » Chemistry-Papers

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

virtual, erect and enlarged

real, inverted and small

real, inverted and same

The focal length of the plane mirror is:

10 cm

zero

25 cm

Infinity

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 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

4 m

2 m

3 m

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

centre of curvature

focus

infinity

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

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

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:

1.5 cm

3.0 cm

2.5 cm

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

Convex

Concave

Plane mirror

A convex lens is:

Called a diverging lens.

Called a converging lens.

The Refractive index of quartz is ___than/to alcohol.

equal

less

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

concave mirror

convex mirror

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

convex mirror

concave mirror

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

plane mirror

convex mirror

concave mirror

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

Always a change in its speed as well as direction.

No change in speed and but not direction.

A change in direction but constant speed.

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 in front of the mirror

3.75 cm behind the mirror

The Refractive index of water is _____

1.33

2.3

1.2

1.5

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

Convex mirror

Concave mirror

Biconvex mirror

Biconcave mirror

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

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

Undefined

Real

Virtual

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

virtual and inverted

real, inverted

virtual and erect

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

Between F and C

At the focus F

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

concave

convex

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

Plano convex

Concave

convex

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 unit of magnification is

none of these

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

Virtual

Both Virtual and Erect

Erect

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

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

positive

negative

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

positive

unity

negative

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?

Between the principal focus and the centre of curvature

Between the pole of the mirror and its principal focus.

At the centre of curvature

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

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

magnification

lateral displacement

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

virtual and erect

real and inverted

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

will emerge parallel to the principal axis

will emerge perpendicular to the principal axis

Linear magnification produced by a concave mirror may be

less than 1 or equal to 1

more than 1 or equal to 1

less than 1, more than 1 or equal to 1

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

both are concave

both are convex

Magnification produced by a plane mirror

less than one

equal to one

greater than one

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 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 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

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

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

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?

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:

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

A convex lens is:

The Refractive index of quartz is ___than/to alcohol.

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

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

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

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

The Refractive index of water is _____

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

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

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

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

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

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

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

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 unit of magnification is

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

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

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

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

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?

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

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

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

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

Linear magnification produced by a concave mirror may be

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

Magnification produced by a plane mirror

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