Lesson 5.4.2
5.4.2 Lens power and the thin lens equation Quiz: Pearson Edexcel Physics, Unit 5
20 questions
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Lesson 5.4.2, Lens power and the thin lens equation: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 5: Waves and Particle Nature of Light, written with Revision Ninja.
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The 20 questions
-
How is the power P of a thin lens defined?
- P = f in centimetres
- P = 1/f, with f in metres
- P = f/1
- P = f squared
-
What is the SI unit of lens power?
- Watt
- Dioptre
- Radian
- Metre
-
What is the sign of the lens power for a converging lens?
- Zero
- Positive
- Negative
- Neutral
-
Two thin lenses are placed in contact with powers P1 and P2. What is the power of the combination?
- P1 x P2
- P1 + P2
- 1/(P1 + P2)
- P1 - P2
-
Which equation is the thin lens equation, using the real-is-positive convention?
- 1/u + 1/v = f
- 1/u - 1/v = 1/f
- 1/u + 1/v = 1/f
- u + v = f
-
Under the real-is-positive sign convention, what sign is given to a virtual image distance?
- Negative
- Neutral
- Positive
- Zero
-
Which expression gives the linear magnification of a thin lens?
- m = u/v
- m = v/u
- m = v - u
- m = f/u
-
A thin converging lens has focal length 0.25 m. What is its power?
- 0.25 D
- 4.0 D
- 0.40 D
- 25 D
-
A thin diverging lens has focal length -50 cm. What is its power?
- 2.0 D
- -0.50 D
- -50 D
- -2.0 D
-
Two thin lenses in contact have powers +5.0 D and -2.0 D. What is the focal length of the combination?
- 33 cm
- 3.0 cm
- 7.0 cm
- 67 cm
-
A converging lens has focal length 12 cm. An object is placed 20 cm from it. How far from the lens is the image?
- 8.0 cm
- 7.5 cm
- 32 cm
- 30 cm
-
A thin lens forms a real image 30 cm from the lens of an object 20 cm from it. What is the linear magnification?
- 1.5
- 2.5
- 0.67
- 10
-
A thin lens forms an image of an object 4.0 cm tall with magnification 1.5. How tall is the image?
- 2.7 cm
- 6.0 cm
- 1.5 cm
- 4.0 cm
-
A thin lens has an object 0.60 m away and forms a real image 0.30 m from it on the other side. What is the power of the lens?
- 3.3 D
- 0.20 D
- 5.0 D
- 1.7 D
-
What is the image distance for an object 0.30 m from a diverging lens of focal length -0.10 m?
- -7.5 cm
- +7.5 cm
- -15 cm
- +15 cm
-
What type of lens has an optical power of -4 D?
- Converging
- Diverging
- Plano-convex
- Biconvex
-
A converging lens of focal length 10 cm is placed in contact with a diverging lens of focal length -20 cm. What is the focal length of the combination?
- -20 cm
- 5 cm
- 10 cm
- 20 cm, converging
-
A thin converging lens of focal length 0.15 m is used with an object 0.60 m away. The object is 3.0 cm tall. How tall is the image?
- 9.0 cm
- 1.0 cm
- 4.5 cm
- 0.20 cm
-
Two thin lenses of power +4.0 D each are placed in contact. What are the power and focal length of the combination?
- 4.0 D, focal length 25 cm
- 8.0 D, focal length 12.5 cm
- 8.0 D, focal length 25 cm
- 2.0 D, focal length 50 cm
-
In lens optics, where does a virtual image form relative to the object?
- Same side
- At infinity
- Opposite side
- Inside lens
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