A) Choose a correct option
a) If a ray of light is incident perpendicularly on a plane mirror, the angle of incidence will be
a) 180°, b) 90°, c) 100°, d) 0°
B) Different between
1) Absorption of light and transmission of light .
2) Incident ray and reflected ray.
3) Angle of incidence and angle of reflection.
4) Plane incidence and plane of reflection.
5) Primary colours and secondary colours.
C) Short answer type of questions
1) State the two laws of reflection?
2) What are the three characteristics of an angle of an image formed by a plane mirror?
3) What do you mean by mirror? What are its two types?
4) Which two colours are mixed to make the colour
a) yellow? b. cyan? c. magenta?
5) Which two factors are majorly responsible for the colour of an object ?
6) What are primary colours? Which colour is made when they mixed together?
7) Name the seven colours of a rainbow
D) Long answer types questions
1) Write five uses of plane mirror.
2) Explain colour subtraction with the help of an example.
3) why is the image of plane mirror laterally inverted
4) the colour of the object is not in the object but the rather light. Explain
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Answers
Answer:
1.The relationship between absorbance and transmittance is illustrated in the following diagram: So, if all the light passes through a solution without any absorption, then absorbance is zero, and percent transmittance is 100%. If all the light is absorbed, then percent transmittance is zero, and absorption is infinite.
2. Incident ray - the ray of light falling on the surface AB is called the incident ray. Reflected ray - the incident ray bouncing back in the same medium after striking the reflecting surface is called reflected ray. ... Normal - it is the line drawn perpendicular to the reflecting surface at the point of incidence.
3. The law of reflection states that the angle of incidence is equal to the angle of reflection. The angle of incidence is the angle between the incident ray and the normal. The angle of reflection is the angle between the reflected ray and the normal at the point where the reflection occurs.
4 .When reflection is specular, as it is for a mirror or other shiny surface, the reflected ray also lies in the plane of incidence; when refraction also occurs, the refracted ray lies in the same plane.
5.Colours which cannot be produced by mixing other colours are called primary colours. ... For this reason red, green and blue are called primary colours. Fig. 31.3 Mixing of the three primary colours. A secondary colour can be produced by mixing other colours.
Choose a correct option
a) If a ray of light is incident perpendicularly on a plane mirror, the angle of incidence will be
a) 180°, b) 90°, c) 100°, d) 0°
B) Different between
1) Absorption of light and transmission of light .
2) Incident ray and reflected ray.
3) Angle of incidence and angle of reflection.
4)
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