7.1 The diagram below shows the reflection of a light ray that strikes a flat mirror with a 30° angle of incidence - NSC Technical Sciences - Question 7 - 2020 - Paper 2
Question 7
7.1 The diagram below shows the reflection of a light ray that strikes a flat mirror with a 30° angle of incidence.
What is reflection?
Use the diagram to write do... show full transcript
Worked Solution & Example Answer:7.1 The diagram below shows the reflection of a light ray that strikes a flat mirror with a 30° angle of incidence - NSC Technical Sciences - Question 7 - 2020 - Paper 2
Step 1
What is reflection?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Reflection is the change in direction of a wave upon striking the interface between two materials. It involves the wave bouncing back into the original medium.
Step 2
Ray AO
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Incident ray
Step 3
Ray OB
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Reflected ray
Step 4
Line M
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Normal
Step 5
Angle 1
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Angle of incidence
Step 6
Angle 2
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Angle of reflection
Step 7
What is the magnitude of angle 2?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Angle 2 is 30° since the angle of reflection is equal to the angle of incidence.
Step 8
How will the speed of light be affected when a light ray travels from air into water, perpendicular to the surface?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The speed of light will decrease when it enters the water.
Step 9
Which medium, air or water, has the higher optical density?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Water has the higher optical density.
Step 10
What will happen to the DIRECTION of the light ray as it enters the water?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The light ray will bend towards the normal as it enters the water.
Step 11
Write down the NAME of the phenomenon in QUESTION 7.4.2.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Refraction
Step 12
Define the term critical angle.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The critical angle is the angle of incidence in the denser medium such that the refracted ray just passes through the surface of separation between the two media.
Step 13
What observation will be made?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
When the angle of incidence is greater than the critical angle, the light ray reflects back into the original medium.
Step 14
Describe the phenomenon total internal reflection.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Total internal reflection occurs when a light ray travels from a denser medium to a less dense medium at an angle greater than the critical angle, resulting in the ray being completely reflected back into the original medium.
Step 15
Is the incident angle GREATER THAN or SMALLER THAN the critical angle?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The incident angle is SMALLER THAN the critical angle.
