Reflection of light at curved surfaces — Revision Notes
Telangana Board · Class 10 · Physical Sciences
Reflection of light at curved surfaces revision notes for Telangana Board Class 10 Physical Sciences: 4 topics in quick points.
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Key Topics to Revise
1. Basic ideas and terms
- A spherical mirror is a mirror with a curved reflecting surface.
- A concave mirror is bent inwards and acts as a converging mirror.
- A convex mirror is bent outwards and acts as a diverging mirror.
2. Image formation by concave mirror
- A concave mirror forms different images at different object positions.
- Object beyond C gives a real, inverted, diminished image between F and C.
- Object at C gives a real, inverted, same-size image at C.
3. Sign convention and mirror formula
- All distances should be measured from the pole.
- Distances measured in the direction of incident light are positive.
- Distances measured opposite to the direction of incident light are negative.
4. Numerical example and calculation method
- An object 4 cm in size is placed 25 cm in front of a concave mirror of focal length 15 cm.
- Under sign convention, f = -15 cm and u = -25 cm.
- Using the mirror formula gives v = -37.5 cm.
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