Light MCQ Quiz-Class 10 » Chemistry-Papers

A convex lens is:

Called a converging lens.

Called a diverging lens.

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

3 m

4 m

2 m

The Refractive index of quartz is ___than/to alcohol.

less

equal

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

called focus on the axis

away from principal axis

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

lateral displacement

magnification

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

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

Magnification produced by a plane mirror

greater than one

less than one

equal to one

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

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 erect

real, inverted

virtual and inverted

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

both are concave

both are convex

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

Plano convex

convex

Concave

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.

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

real and inverted

virtual and erect

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

convex mirror

concave mirror

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

Virtual

Undefined

Real

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

Convex

Concave

Plane mirror

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

1.5 cm

2.5 cm

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

plane mirror

convex mirror

concave mirror

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

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 pole of the mirror and its principal focus.

Between the principal focus and the centre of curvature

At the centre of curvature

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

real, inverted and same

real, inverted and small

virtual, erect and enlarged

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

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

negative

positive

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 (convex)

1.60 cm (concave)

The focal length of the plane mirror is:

25 cm

zero

10 cm

Infinity

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

focus

infinity

centre of curvature

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

concave

convex

Linear magnification produced by a concave mirror may be

more than 1 or equal to 1

less than 1 or equal to 1

less than 1, more than 1 or equal to 1

The Refractive index of water is _____

1.5

2.3

1.33

1.2

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

Erect

Virtual

Both Virtual and Erect

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

unity

positive

negative

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

Biconcave mirror

Biconvex mirror

Concave mirror

Convex mirror

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

concave mirror

convex mirror

The unit of magnification is

none of these

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

Convex mirror

Either a plane mirror or a convex mirror

Plane 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

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

A convex lens 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

The Refractive index of quartz is ___than/to alcohol.

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

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

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

Magnification produced by a plane mirror

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?

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

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

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

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

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

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

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

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

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

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

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?

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

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

The focal length of the plane mirror is:

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

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

Linear magnification produced by a concave mirror may be

The Refractive index of water is _____

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

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:

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

The unit of magnification is

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

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

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

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