Reflection of Light: Spherical Mirrors — Flashcards
ICSE · Class 12 · Physics
30 flashcards for Reflection of Light: Spherical Mirrors (ICSE Class 12 Physics) to test yourself on key terms and facts.
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State the definition of a concave mirror.
Answer
A concave mirror is one whose reflecting surface is towards the centre of the sphere of which the mirror is a part. It forms a real focus for parallel rays.
State the definition of a convex mirror.
Answer
A convex mirror is one whose reflecting surface is away from the centre of the sphere of which the mirror is a part. It forms a virtual focus and always gives a virtual, erect, diminished image for a …
What is the pole of a spherical mirror?
Answer
The pole is the central point of the reflecting surface of the mirror. It is taken as the origin in the New Cartesian sign convention.
What is the centre of curvature and how is it related to radius of curvature?
Answer
The centre of curvature is the centre of the sphere of which the mirror forms a part. The distance between the pole and the centre of curvature is the radius of curvature, so PC = R.
What is the principal axis of a spherical mirror?
Answer
The principal axis is the straight line joining the pole and the centre of curvature of the mirror and extended on both sides. It is the X-axis in the New Cartesian sign convention.
What is the principal focus of a spherical mirror?
Answer
The principal focus is the point on the principal axis at which light rays parallel to the principal axis, after reflection, actually meet or appear to come from. For a concave mirror it is real and l…
State the relation between focal length and radius of curvature for a spherical mirror.
Answer
For paraxial rays and small aperture, f = R/2. Here f is focal length and R is radius of curvature.
A concave mirror has radius of curvature 40 cm. Find its focal length.
Answer
Given: R = 40 cm Formula: f = R/2 Step 1: f = 40/2 cm Step 2: f = 20 cm Answer: focal length = 20 cm. By sign convention for a concave mirror, f is negative, so f = -20 cm.
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