Light Continued
Akopọ
A straw looks bent in a glass of water, a diamond sparkles with rainbow fire, and a tiny camera lens captures a whole landscape. All of these come from one idea: light changes speed and bends when it crosses between materials. Control that bending and you can focus, magnify, trap light in a fibre, or split white light into its colours.
In this lesson you will master refraction and refractive index, the critical angle and total internal reflection (with its use in optical fibres), the action of converging and diverging lenses, ray diagrams for real and virtual images, the dispersion of white light by a prism, and the seven colours of the spectrum. Every calculation is shown with its equation, substitution and units.
Awọn Afojusun
- Define and use the terms normal, angle of incidence and angle of refraction
- Describe an experiment to show refraction of light by transparent blocks of different shapes
- Describe the passage of light through a transparent material (limited to the boundaries between two mediums only)
- State the meaning of critical angle
- Describe internal reflection and total internal reflection using both experimental and everyday examples
- Describe the action of thin converging and thin diverging lenses on a parallel beam of light
- Define and use the terms focal length, principal axis and principal focus (focal point)
- Draw and use ray diagrams for the formation of a real image by a converging lens
- Describe the characteristics of an image using the terms enlarged/same size/diminished, upright/inverted and real/virtual
- Know that a virtual image is formed when diverging rays are extrapolated backwards and does not form a visible projection on a screen
- Describe the dispersion of light as illustrated by the refraction of white light by a glass prism
- Know the traditional seven colours of the visible spectrum in order of frequency and in order of wavelength
- [Supplement] Define refractive index, n, as the ratio of the speeds of a wave in two different regions
- [Supplement] Recall and use the equation sin i n = sin r
- [Supplement] Recall and use the equation n = 1 / sin c
- [Supplement] Describe the use of optical fibres, particularly in telecommunications
- [Supplement] Draw and use ray diagrams for the formation of a virtual image by a converging lens
- [Supplement] Describe the use of a single lens as a magnifying glass
- [Supplement] Describe the use of converging and diverging lenses to correct long-sightedness and short- sightedness
- [Supplement] Recall that visible light of a single frequency is described as monochromatic
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Light Continued. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- When light passes from air into glass it bends A. away from the normal and speeds up B. towards the normal and slows down C. towards the normal and speeds up D. along the surface Answer: B
- A glass has refractive index 1.5. Light travels in it at (speed in air = 3.0 x 10^8 m/s) A. 4.5 x 10^8 m/s B. 3.0 x 10^8 m/s C. 2.0 x 10^8 m/s D. 1.5 x 10^8 m/s Answer: C
- The critical angle of a material of refractive index 2.0 is closest to (sin c = 1/n) A. 24 degrees B. 30 degrees C. 42 degrees D. 60 degrees Answer: B
- An object placed beyond 2F from a converging lens forms an image that is A. virtual, upright, enlarged B. real, inverted, diminished C. real, upright, same size D. virtual, inverted, enlarged Answer: B
- Which colour of the visible spectrum is refracted the most by a prism? A. red B. yellow C. green D. violet Answer: D
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Light Continued? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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