Question

What is radius curvature of
plane mirror???
Why paper catches fire when a
convex lens is used a ficus
sunlight
​

Answer 1

• the radius of curvature of plane mirror is equal to infinity
• because convex lens diverse all ray at the same point on focus .

Answer 2

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→radius of curvature of plane mirror is ∞

paper catches fire because all the rays gets focused at that point.