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Telangana SSC (Class 10) — free MCQ practice

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Telangana SSC (Class 10) subjects

Chemistry (36)Physics (32)

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Acids, Bases and SaltsReflection of Light at Curved Surfaces

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The mid point (geometric centre) of a spherical mirror is called itsRead the answer and worked solution →For a concave mirror the focus and centre of curvature lieRead the answer and worked solution →The relation between radius of curvature R and focal length f of a spherical mirror isRead the answer and worked solution →Which mirror converges a parallel beam of light to a real focus?Read the answer and worked solution →

Worked practice questions

The mid point (geometric centre) of a spherical mirror is called its

  1. pole
  2. focus
  3. vertex
  4. rim
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Correct answer: A. pole

1. A spherical mirror is a slice of a large sphere. 2. Its geometric mid point, lying on the surface, is the pole (P). 3. The focus and centre of curvature sit on the axis, not at the surface mid point. _Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_

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For a concave mirror the focus and centre of curvature lie

  1. behind the mirror
  2. in front of the mirror
  3. upon the surface
  4. at infinite distance
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Correct answer: B. in front of the mirror

1. A concave mirror reflects from its inner, caved-in surface. 2. Parallel rays actually converge on that side. 3. So both F and C lie in front of the mirror. _Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_

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The relation between radius of curvature R and focal length f of a spherical mirror is

  1. f = 2R
  2. R = f
  3. R = 2f
  4. R = f/2
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Correct answer: C. R = 2f

1. The focus is where paraxial parallel rays meet after reflection. 2. Geometry places it midway between the pole and centre of curvature. 3. So the radius of curvature is twice the focal length, R = 2f. _Source: AP/TS SCERT Class 10 Physical Science, "Reflection of Light at Curved Surfaces"_

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