BRAINCAKEExam-style Question 4
Question
A converging lens has a focal length of 20 cm. An object 1.5 cm tall is placed 30 cm from the lens.
(a) Calculate the power of the lens. (2)
(b) Calculate the distance of the image from the lens. (2)
(c) Calculate the magnification and the height of the image. (2)
(d) State two properties of the image. (2)
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Key terms in this lesson
- magnification
- The ratio of the image height to the object height, or of the image distance to the object distance, for a lens.
- focal length
- The distance from the centre of a lens to the principal focus, where parallel rays converge, or appear to diverge from, after refraction.
More in Optics
- Image Calculations
- Magnification
- Plane Polarisation
- Polarising Filters
- Polarisation by Reflection and Refraction
- Exam-style Question 1
- Exam-style Question 2
- Exam-style Question 3
All 21 lessons in Optics · All Edexcel AS-level Physics topics