What happens to a ray of light passing through the focus of a convex lens after refraction?

It becomes parallel to the principal axis

A convex lens forms an image which is real, inverted and equal to the size of the object, if the object is placed:

between optical centre and focus

In order to determine the focal length of a convex lens, the image of a distant object is obtained on a wall. The focal length of the lens will be the distance measured between:

wall and tree and also between lens and screen

A sharp image of a distant object is obtained on a screen by using a convex lens. In order to determine the focal length of the lens, you need to measure the distance between the:

lens and the screen and also object and the screen

In an experiment to determine the focal length of a convex lens, a student obtained a sharp inverted image of a distant tree on the screen behind the lens. He then removed the screen and looked through the lens in the direction of the object. He will see:

an inverted image of the tree at the focus of the lens.

no image as the screen has been removed

a blurred image on the wall of the laboratory.

an erect image of the tree on the lens.

A transparent refracting medium

What is the principal axis of a lens?

A line joining the centers of curvature of two spherical surfaces

A line connecting two focal points

A line perpendicular to the lens

What is the focal length of a lens defined as?

The distance between the principal focus and the optical center

The distance between the lens and the object

The distance between the lens and the image

The distance between the principal focus and the secondary focus.

What is the lens formula used for?

Determining the focal length of the lens

Calculating the power of the lens

What is the power of a lens related to?

Its ability to converge or diverge light

How is linear magnification defined?

The ratio of the image height to the object height

The ratio of the image distance to the object distance

The ratio of the object distance to the image distance

The ratio of the object height to the image height.

ICSE.X.PHYSICS. 5. REFRACTION THROUGH A LENS

Authored by Nitin sir

Physics

10th Grade

Used 5+ times

ICSE.X.PHYSICS. 5. REFRACTION THROUGH A LENS

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A point object is placed at a distance of 12 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at a distance of 18 cm from the lens. Find the focal length of the lens.

7.2 cm

10 cm

15 cm

20 cm

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An object 3 cm high is placed at a distance of 20 cm in front of a convex lens of focal length 12 cm. Find the position of the image formed.

30 cm.

25 cm.

15 cm.

10 cm.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A convex lens has a focal length of 20 cm. Find the distance from the lens where an object should be placed so that it forms an image at a distance of 40 cm on the other side of the lens.

40 cm.

10 cm.

30 cm.

60 cm.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm. Find the position and size of the image formed.

16.67 cm, 3.33 cm.

20 cm, 4 cm.

15 cm, 3 cm.

10 cm, 2 cm.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An object of size 3 cm is placed at a distance of 15 cm from a convex lens of focal length 10 cm. Find the size of the image formed.

6 cm.

3 cm.

9 cm.

12 cm.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 30 cm. The distance of the object from the lens is 20 cm. Find the position of the image formed.

60 cm

-60 cm

30 cm

-30 cm

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens?

30 cm.

20 cm.

25 cm.

35 cm.

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ICSE.X.PHYSICS. 5. REFRACTION THROUGH A LENS

A point object is placed at a distance of 12 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at a distance of 18 cm from the lens. Find the focal length of the lens.

An object 3 cm high is placed at a distance of 20 cm in front of a convex lens of focal length 12 cm. Find the position of the image formed.

A convex lens has a focal length of 20 cm. Find the distance from the lens where an object should be placed so that it forms an image at a distance of 40 cm on the other side of the lens.

An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm. Find the position and size of the image formed.

An object of size 3 cm is placed at a distance of 15 cm from a convex lens of focal length 10 cm. Find the size of the image formed.

A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 30 cm. The distance of the object from the lens is 20 cm. Find the position of the image formed.

A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens?

A 8 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 25 cm. The distance of the object from the lens is 30 cm. Find the size of the image formed.

A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find the size of the image formed.

A compound lens is made of two lenses in contact having powers +12.5 D and –2.5D. Find the focal length of the combination.

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