1. Q: What is the definition of reflection?
A: Reflection is the change in direction of light when it hits a surface.
2. Q: What is the law of reflection?
A: The law of reflection states that the angle of incidence is equal to the angle of reflection.
3. Q: What is a mirror?
A: A mirror is a smooth surface that reflects light.
4. Q: What is the difference between a plane mirror and a spherical mirror?
A: A plane mirror is a flat mirror, while a spherical mirror is curved.
5. Q: What is the focal length of a mirror?
A: The focal length of a mirror is the distance between the mirror and the point where parallel light rays converge.
11. Q: What is the definition of refraction?
A: Refraction is the bending of light as it passes from one medium to another.
12. Q: What is Snell's law?
A: Snell's law states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the velocities of the two media.
13. Q: What is a lens?
A: A lens is a transparent medium that refracts light.
14. Q: What is the difference between a convex lens and a concave lens?
A: A convex lens is thicker in the middle, while a concave lens is thinner in the middle.
15. Q: What is the focal length of a lens?
A: The focal length of a lens is the distance between the lens and the point where parallel light rays converge.
21. Q: What is the structure of the human eye?
A: The human eye consists of the cornea, iris, lens, retina, and optic nerve.
22. Q: How does the human eye focus on objects?
A: The human eye focuses on objects by changing the shape of the lens.
23. Q: What is the difference between myopia and hypermetropia?
A: Myopia is near-sightedness, while hypermetropia is far-sightedness.
24. Q: What is the function of the retina?
A: The retina detects light and sends signals to the brain.
25. Q: What is the importance of the human eye?
A: The human eye is essential for our sense of sight.
31. Q: What is the definition of electricity?
A: Electricity is a form of energy that is generated by the movement of charged particles.
32. Q: What is the difference between a conductor and an insulator?
A: A conductor allows electricity to flow, while an insulator does not.
33. Q: What is a circuit?
A: A circuit is a path through which electricity flows.
34. Q: What is the difference between a series circuit and a parallel circuit?
A: A series circuit has components connected one after the other, while a parallel circuit has components connected between the same two points.
35. Q: What is the importance of electricity?
A: Electricity is essential for our daily lives.
41. Q: What is the definition of magnetism?
A: Magnetism is a force that acts between magnetic fields.
42. Q: What is the difference between a permanent magnet and an electromagnet?
A: A permanent magnet is a magnet that retains its magnetic field forever, while an electromagnet is a magnet that is created by an electric current.
43. Q: What is the principle of electromagnetic induction?
A: Electromagnetic induction is the production of an electromotive force (EMF) across an electrical conductor in a changing magnetic field.
44. Q: What is the importance of magnetic effects of electric current?
A: Magnetic effects of electric current are essential for many modern technologies.
45. Q: What is the difference between a generator and a motor?
A: A generator converts mechanical energy into electrical energy, while a motor converts electrical energy into mechanical energy.
46. Q: What is the principle of a transformer?
A: A transformer is a device that transfers electrical energy from one circuit to another through electromagnetic induction.
47. Q: What is the importance of transformers?
A: Transformers are essential for the transmission and distribution of electrical energy.
