Question

4. If the angle of incidence is 45%, the angle of reflection will be
(a) 30
(b) 40
(c) 90
(d)45

5. Green grass in a park appears when viewed in red light, as
(a) white
(b) green
(c) black
(d) red

II. Fill in the blanks with the correct option: incident, plane ,reflected, red ,green ,black, none

1. The image formed by_______ a mirror is laterally inverted, basic laws of reflection.

3. A ray of light which falls on a mirror is called a(an)______ rays

4. A ray which is sent back to a original medium by the reflecting surface is called ______ray


III. State if the following statements are True or False. Correct the false statement.

1. Return of light after striking a surface is called the refraction of light.

2. The reflection that occurs when a beam of light falls on a smooth surface is called reflection

3. The reflection that occurs when a beam of light falls on wood or walls is called irregular reflection

4. The left-right inversion of the image and the object is called lateral inversion.

5. Magenta, cyan and green are secondary colours.

6. Light travels at a speed of 3 * 10" m/s in glass.

7. Light travels much slower than sound in air.

V. Pick the odd-one out. Give scientific reason for your answer.
1. Wood, wall, plane mirror, brick
2. Plastic, soap, wall, soap bubble
3. Normal, reflected ray, incident ray, point of incidence
4. Red, blue, cyan, green​

Answer 1

Answer:

1. 45°
2. white
3. plane mirror
4. incident ray
5. reflected ray
6. False(Reflection not refraction)
7. True
8. True
9. True
10. True
11. True
12. False (Light travels much faster than sound)
13. Plane mirror (rest don't do regular reflection)
14. Soap bubble (It reflects)
15. point of incidence
16. cyan (rest are primary colours this is secondary colour

Answer 2

4= C 5=D (2) 1=plane 3=reflected 4= incident (3) 1=