Physics (9-1) - 0972 CIE

Light

Bayani Gaba-gaba

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.

Manufura

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

Takardar Darasi

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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Nazarin Darasi

Barka da kammala darasi akan Light. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

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