alleryStart learning →What is the focal length of a plane mirror?
AExactly zero
BVery large, finite
CSame as its width
DInfinitely large
Answer & Solution
Correct answer: D. Infinitely large
A flat mirror does not converge or diverge parallel rays, so its focal length is infinite.
Keep practising Light
Browse all Light questions for Olympiad (Class 7), or explore more Science topics.
Related questions
Why do night animals' eyes shine in a torch beam?A ray makes 25 degrees with a plane mirror's surface. What angle does it make with the refHow are the incident ray, reflected ray and normal related?By the laws of reflection, where do the incident ray and reflected ray lie relative to theLight hits the surface of water. Which statement is correct?Compared with a mirror, a glass window reflects light in what way?What does an ordinary household mirror usually have behind its glass sheet?An echo is an example of which wave behaviour?