Physics - 9203 OxfordAQA

Reflection

Gbogbo ọrọ náà

Look at the front of an ambulance in your mirror and the word across its bonnet suddenly makes sense. It was painted back to front on purpose, because the only driver who needs to read it is the one looking at it through a piece of silvered glass. Somebody in a paint shop had to know, in advance and exactly, what a mirror does to a shape. They were not guessing. Reflection is one of the most precisely predictable things in the whole of physics, and the rule behind it fits into nine words.

This lesson turns that rule into a skill. You will learn where the normal is drawn and why every angle in this topic is measured from it rather than from the shiny surface itself, which is where most of the marks on this topic are quietly thrown away. You will then learn to build a ray diagram: to place the image behind the mirror by construction, find the exact point where the light bounces on its way to somebody's eye, and follow how that path shifts when the object moves, when the eye moves, or when the mirror itself is turned. By the end you will be able to say why the letters on the ambulance are reversed left to right and not top to bottom, which is a question far more people get wrong than get right.

Ebumnobi

When waves are reflected the angle of incidence is equal to the angle of reflection.
The normal is a construction line perpendicular to the reflecting surface at the point of incidence.
The image produced in a plane mirror is virtual, upright and laterally inverted. Students will be expected to be able to construct ray diagrams to represent the changing path of reflected rays.

Maapụ uche

E seela isiokwu a ka ị hụ otu echiche si ejikọta.

Mepee maapụ uche na ngwa

Akwụkwọ Ọmụmụ

Somewhere there is a sign writer who has to letter the bonnet of an ambulance, and the job comes with an unusual instruction: write it back to front. The only person who will ever need to read that word is a driver glancing into a rear view mirror, and the mirror is going to reverse it. Get the reversal right and the word snaps into place in the mirror at forty metres. Get it wrong and it is unreadable in both directions at once.

Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge

Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.

Akwụkwọ ndụmọdụ zuru oke nwere eserese

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Reflection. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

A ray of light strikes a plane mirror. The angle between the incident ray and the surface of the mirror is 30 degrees. What is the angle of reflection? A. 15 degrees B. 30 degrees C. 60 degrees D. 120 degrees Answer: C
What is the normal in a reflection diagram? A. A ray of light travelling along the reflecting surface B. A construction line drawn perpendicular to the reflecting surface at the point of incidence C. The reflected ray D. A line joining the object to the edge of the mirror Answer: B
Which set correctly describes the image formed in a plane mirror? A. Real, upright and laterally inverted B. Virtual, upright and laterally inverted C. Virtual, upside down and the same way round left to right D. Real, upside down and magnified Answer: B
An object is placed 5.0 cm in front of a plane mirror. What is the distance between the object and its image? A. 2.5 cm B. 5.0 cm C. 10.0 cm D. 25 cm Answer: C
A plane mirror is rotated through 8 degrees while the incident ray is kept fixed. Through what angle does the reflected ray turn? A. 4 degrees B. 8 degrees C. 16 degrees D. 32 degrees Answer: C

Rue ajuju ndi a n'ime ngwa ahu