Edexcel A Level Physics:复习笔记5.22 The Lens Equation
The Lens Equation
- This equation can be applied to all thin converging and diverging lenses
- The equation relates the focal length of the lens to the distances from the lens to the image and the object
- Where:
- f = focal length (m)
- v = image distance from lens (m)
- u = object distance from lens (m)
- This equation only works for thin converging or diverging lenses
- The values are positive if the image is real
Worked Example
A student investigates the focal length of a thin lens by using it to project and image onto a screen.
The object is set 50.0 cm from the centre of the lens and the screen moved back and forth until the inverted image is sharp. This position is found to be 75.0 cm from the lens.
Determine the focal length of the lens.
Step 1: Write the known values
-
- Distance from object to lens, u = 50.0 cm
- Distance from image to lens, v = 75.0 cm
Step 2: Write the equation and substitute in the values
f = 30 cm
Exam Tip
It is easy to forget the last step in a calculation like this one. Remember that you are calculating not f, and that you need to take the reciprocal of your answer.
转载自savemyexams
以上就是关于【Edexcel A Level Physics:复习笔记5.22 The Lens Equation】的解答，如需了解学校/赛事/课程动态，可至翰林教育官网获取更多信息。
往期文章阅读推荐：
重磅！CAIE明年提前出分，爱德思理科也迎大改！这届考生如何破局？
EDX考前急救！只讲高频考点！2027年1月A-Level大考，如何用12小时极限冲刺A*？
翰林AMC8视频课重磅上线！
