Lenses - exam practice
Lenses
Question 1 of 8
1 of 8
A system of lenses consists of a converging lens and a diverging lens in contact.
The magnitude of the power of the converging lens is 9.4 D and the magnitude of the power of the diverging lens is 4.2 D.
Which of the following is the power of this system of lenses?
Question 2 of 8
2 of 8
Which of the following lenses would produce a real image of an object placed 15 cm away from the lens?
Question 3 of 8
3 of 8
A diverging lens is used to produce an image of a real object.
Select the row of the table that correctly identifies the nature of the image produced.
| Real or virtual? | Upright or Inverted? | |
|---|---|---|
| A | Real | Upright |
| B | Real | Inverted |
| C | Virtual | Upright |
| D | Virtual | Inverted |
Question 4 of 8
4 of 8
A slide projector has a lens of focal length f. It is set up to give a large, magnified focussed image on a screen. The screen is further than 2 f from the lens centre.
Where is the slide (object) placed?
Question 5 of 8
5 of 8
A real image is formed by a lens of power 20 D.
Which statement is correct?
Question 6 of 8
6 of 8
An object is placed 6.5 cm away from a lens of focal length 3.9 cm. An image is formed 9.8 cm from the lens.
Which of the following is the magnification?
Question 7 of 8
7 of 8
A converging lens is used as a magnifying glass. An image is produced that is 30 cm away from the lens and twice as big as the object.
Choose the row that correctly identifies the nature of the image and the object distance.
| Nature of image | Object distance (cm) | |
|---|---|---|
| A | real | 15 |
| B | real | 60 |
| C | virtual | 15 |
| D | virtual | 60 |
Question 8 of 8
8 of 8
A converging lens produces a focussed image at a distance of 0.40 m from the lens.
The magnification of the image is 2.0.
What is the power of the lens?