Action of lenses (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
ShowHide
Practise the questions
10 questions from this quiz
How does the focal length of a lens relate to its surface curvature?
How does the focal length of a lens relate to its surface curvature?
More curved = shorter focal length
What defines a real image?
What defines a real image?
Light rays actually pass through it
What is the unit of lens power?
What is the unit of lens power?
Dioptre (D)
What sign convention applies to converging and diverging lenses?
What sign convention applies to converging and diverging lenses?
Converging = positive, diverging = negative
When the eye focuses on distant objects, what happens to the ciliary muscles?
When the eye focuses on distant objects, what happens to the ciliary muscles?
They relax
What is the near point for a young, healthy eye?
What is the near point for a young, healthy eye?
Approximately 25 cm
What is the total power range of the human eye?
What is the total power range of the human eye?
Approximately +60 D to +74 D
For a convex lens, what happens to a ray parallel to the principal axis?
For a convex lens, what happens to a ray parallel to the principal axis?
Refracts through opposite-side focus
In the lens formula , what does negative indicate?
In the lens formula , what does negative indicate?
Virtual, upright image