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Q U E S T I O N S
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Define the principal focus of a concave mirror.
The radius of curvature of a spherical mirror is 20 cm. What is its focal
length?
Name a mirror that can give an erect and enlarged image of an object.
Why do we prefer a convex mirror as a rear-view mirror in vehicles?
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Answers
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Answer:
1. It is a point on the principal axis where the rays of light parallel to principal axis meet.
2. R = 20cm
R = 2f
f = R/2,
f = 20/2 = 10cm.
Focal length is 10cm.
3. Concave mirror.
4. Convex mirror can cover a wider range and give erect and diminished image. Hence convex mirror is used as a rear-view mirror to get wider field of view.
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