The radius of curvature of a concave mirror is 30cm. What is the focal length of this mirror.¿?
Answers
Answered by
6
Given :-
Radius of a concave mirror is 30 cm.
- R = 30 cm
To Find :-
- Focal length of the mirror
Point to remember :-
Focal length:-The distance from the lens to the focal point is called the focal length.
For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths.
Formula used :-
i.e. Radius is Double of the focal length.
Solution :-
Therefore,
Focal length of the given mirror with radius of 30 cm is 15 cm.
Answered by
0
Answer:
Explanation:
- For spherical mirrors having a small aperture, the radius of curvature is twice the focal length.
- Let R be the radius of curvature and f be the focal length then,
...(1)
and
...(2)
In the question, it is given that,
Substitute the value of 'f' into equation(1),
We get,
- The focal length will be
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