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Questions and Answers
What is reflection?
What is reflection?
- The absorption of light by a surface
- The scattering of light in all directions
- The bending of light at the interface of two different mediums
- The bouncing back of light into the same medium by a smooth surface (correct)
What are the two types of refractive index?
What are the two types of refractive index?
- Direct and inverse
- Positive and negative
- Real and imaginary
- Relative and absolute (correct)
What is the law of refraction?
What is the law of refraction?
- The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant (correct)
- The ratio of the sine of the angle of incidence to the cosine of the angle of refraction is constant
- The ratio of the cosine of the angle of incidence to the sine of the angle of refraction is constant
- The ratio of the tangent of the angle of incidence to the sine of the angle of refraction is constant
What is the difference between a converging lens and a diverging lens?
What is the difference between a converging lens and a diverging lens?
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What is the optical center of a lens?
What is the optical center of a lens?
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What is the principal axis of a lens?
What is the principal axis of a lens?
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What is the aperture of a lens?
What is the aperture of a lens?
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What is the focus of a lens?
What is the focus of a lens?
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What is the magnification produced by a lens?
What is the magnification produced by a lens?
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What is the power of a lens?
What is the power of a lens?
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Study Notes
- CBSE Class 10 Science Notes Chapter 10 is about light reflection and refraction.
- Reflection is the bouncing back of light into the same medium by a smooth surface.
- Mirrors can be plane or spherical.
- Refraction is the bending of light at the interface of two different mediums.
- Lenses are a transparent refracting medium bounded by two surfaces.
- There are two types of refractive index: relative and absolute.
- The law of refraction states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant.
- Special rays are used for image formation by mirrors and lenses.
- Mirrors and lenses have different parameters, including focal length and magnification.
- The position of the image for various positions of the object can be determined using tables.
- A lens refracts light and can be convex or concave.
- A lens with a higher refractive index than the lens can convert it from convex to concave.
- A converging lens is thicker at the center while a diverging lens is thicker at the edges.
- The optical center of a lens is the point where a ray passing through it is undeviated.
- The principal axis of a lens is the line joining its two centers of curvature and passing through the optical center.
- The aperture is the effective width of a lens through which refraction occurs.
- The focus is the point where a beam of light moving parallel to the principal axis converges or meets.
- The focal length is the distance between the focus and the optical center.
- The magnification produced by a lens is the ratio of the size of the image to the size of the object.
- The power of a lens is the reciprocal of its focal length and is measured in diopters.
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