WorksheetsLenses
Total questions: 21
Worksheet time: 25mins
The ray diagram shows how an image is formed by a converging lens:
What is it’s focal length ?
8 cm
10 cm
18 cm
24 cm
A thin converging lens is used to produce, on a screen, a focused image of a candle:
The screen and the lens are moved back and forth and various focused images are produced on the screen.
Which statement is always true?
The image is at the principal focus (focal point) of the lens.
The image is bigger than the object.
The image is closer to the lens than the object is.
The image is inverted.
A parallel beam of light falls on a converging lens. Which diagram shows what happens to the beam of light?
A
B
C
D
Two thin converging lenses X and Y are used as shown to give a focused image of an illuminated slit. The rays shown are parallel between X and Y:
What are the correct values for the focal lengths of X and of Y?
A
B
C
D
In the diagram, the distance OP is the focal length of the lens. Through which point will the ray shown pass, after refraction by the lens?
A
B
C
D
The diagram shows the path of a ray of light passing through a principal focus F of a lens. Which broken line shows the direction of the ray after it leaves the lens?
A
B
C
D
An object O is placed in front of a converging lens of focal length f. At which point will the top of the image be seen?
A
B
C
D
An object is placed in front of a converging lens. The lens has a focal length f. The lens produces a real, enlarged image of the object. In which labelled position is the object placed?
A
B
C
D
A student draws a diagram representing three rays of light from point P passing through a converging lens. Each point labelled F is a principal focus of the lens:
Which of the rays has the student drawn correctly?
Ray X and ray Y
ray X and ray Z
ray Y only
ray Z only
The diagram shows a converging lens forming an image of an object:
Which statement about the image is correct?
It is real and can be seen by an eye at X.
It is real and can be seen by an eye at Y.
It is virtual and can be seen by an eye at X.
It is virtual and can be seen by an eye at Y.
An object O is placed close to a thin converging lens. The diagram represents three rays from the top of O passing through the lens:
Which type of image is produced by the lens when the object O is in this position?
real and diminished
real and enlarged
virtual and diminished
virtual and enlarged
A student starts to draw a ray diagram for an object at O, near a thin convex lens, but is not sure
whether the image is formed at X or at F:
The correctly drawn image is
real and formed at F
real and formed at X
virtual and formed at F
virtual and formed at X
The diagram shows a ray of monochromatic light passing through a semi-circular glass block.
What is the refractive index of the glass?
0.64
0.77
1.31
1.56
The diagram shows a ray of light incident on the edge of a piece of glass. The angle i is bigger than the critical angle. Which arrow correctly shows the direction of the ray after it leaves the edge of the glass?
A
B
C
D
A scientist is trying to direct a ray of light through a glass block without any light
leaving the top of the block. However, some light does leave the top.
The scientist changes angle X and stops the ray of light leaving the top.
Which row in the table describes the change to angle X and the name of the effect produced?
A
B
C
D
Which correct ray shows focal length
A
B
C
D
What is the focal length of the lens?
40 cm
50 cm
72 cm
90 cm
Which diagram shows how an image of an object is formed on a screen by a converging lens?
A
B
C
D
The diagram represents a converging lens forming an image of an object.
Which distance is the focal length of the lens?
PQ
PR
QR
QS
A converging lens in a projector is used to make an enlarged image of a small piece of film on a screen.
At which labelled point could the piece of film be placed so that the lens produces this image?
A
B
C
D
Which diagram shows how a converging lens is used as a magnifying glass?
A
B
C
D
