Question

A. Choose the correct option.
1. The angle of incidence is the angle between
a) the incident ray and the mirror
b) the incident
ray
and the normal
c) the incident ray
and the reflected ray
d) the reflected ray and the normal
2. When the angle of incidence is 40°, the
angle of reflection is
b) 50°
d) 40°
3. Which of these statements about the image
produced by a plane mirror is incorrect?
It is laterally inverted.
b) It is of the same size as the object.
c) It can be captured on a screen.
d) It is behind the mirror.
a) 80°
c) 20°​

Answer 1

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✰ 1. The angle of incidence is the angle between

⇒ The incident ray and the normal (b)

• The incident ray is the ray forms when the light strikes at the point of incidence.
• The normal is the perpendicular line to the point of the incidence.
• The ray between perpendicular (normal) & incident ray is called angle of incidence.

⠀⠀⠀⠀⠀______________

✰ When the angle of incidence is 40°, the angle of reflection is

⇒ 40° (d)

• The second law of reflection states that the angle of incidence is always equivalent to the angle of reflection.
• Therefore, if the angle of incidence is 40°, theangle of reflection is also 40°.

⠀⠀⠀⠀⠀______________

✰ Which of these statements about the image produced by a plane mirror is incorrect?

⇒ It can be captured on a screen. (c)

• The image formed by a plane mirror is always virtual.
• "Virtual" means that it can't be obtained on a screen, the plane mirror can't form a real image.
• Therefore, option (c) is correct as it is incorrect about the image produced by a plane mirror.

⠀⠀⠀⠀⠀______________

Answer 2

1. b) incident ray and the normal

2. d) 40 degrees (since angle of incidence = angle of reflection)

3. d) it is behind the mirror.