Physics (9-1) - 0972 CIE

Light

Gbogbo ọrọ náà

Every time you glance in a mirror you are using a law of physics that is exact to a fraction of a degree: light bounces off a smooth surface so that the angle it arrives at equals the angle it leaves. That single rule lets us predict exactly where an image appears and why your reflection looks the size and distance it does.

In this topic you will define the normal and the angles of incidence and reflection, state and use the law of reflection, and describe the image formed by a plane mirror. You will also learn to construct and measure ray diagrams for reflection, the skill that turns the law into accurate predictions.

Ebumnobi

Define and use the terms normal, angle of incidence and angle of reflection
Describe the formation of an optical image by a plane mirror and give its characteristics, i.e. same size, same distance from mirror, virtual
State that for reflection, the angle of incidence is equal to the angle of reflection; recall and use this relationship
[Supplement] Use simple constructions, measurements and calculations for reflection by plane mirrors

Akọmọ Ojú-ẹkọ

Mirrors steer light in periscopes, dental mirrors, car wing mirrors and laser instruments. The law of reflection is one of the most reliable rules in physics, and exam questions test whether you can name the angles correctly, apply the law, and describe the image a plane mirror forms.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Light. 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.

The angle of incidence is measured between the incident ray and the: A. mirror surface B. reflected ray C. normal D. horizontal Answer: C
A ray hits a plane mirror with an angle of incidence of 30 degrees. The angle of reflection is: A. 60 degrees B. 30 degrees C. 15 degrees D. 90 degrees Answer: B
The image formed by a plane mirror is: A. real and larger B. virtual and the same size C. real and inverted D. virtual and smaller Answer: B
A ray strikes a mirror at 20 degrees to the surface. The angle of reflection from the normal is: A. 20 degrees B. 40 degrees C. 70 degrees D. 90 degrees Answer: C
An object is 5 cm in front of a plane mirror. Its image is: A. 5 cm in front B. 10 cm behind C. 5 cm behind D. on the mirror Answer: C