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Solve exercise C1 page 18 Textbook Physics 7
Problem statement:
Given a flat mirror (figure 6.1) and a pencil.
a) Find a way to place the pencil in front of the mirror so that its image formed by the mirror has the following properties successively:
- Parallel, same direction as the object.
- Same orientation, opposite direction to the object.
b) Draw the image of the pencil in the two cases above.
Solution:
a)
- Image parallel, same direction as the object: place the pencil parallel to the mirror.
- Image same direction, opposite to the object: place the pencil perpendicular to the mirror.
b) Draw the image:
- Image parallel, same direction as the object:
- Image same direction, opposite to the object:
Solve exercise C2 page 18 Physics 7 Textbook
Problem statement:
Arrange the experiment as shown in figure 6.2. Place the flat mirror upright on the table surface. Observe the image of the table behind. Use chalk to mark the two farthest points P and Q at the ends of the table visible in the mirror.
PQ represents the width of the visible area of the flat mirror.
Solution:
Students conduct the experiment themselves.
Solve exercise C3 page 18 Physics 7 Textbook
Problem statement:
Will the width of the visible area of the mirror increase or decrease as the mirror is moved farther away from the eye?
Solution:
As the mirror is moved farther away from the eye, the width of the visible area of the mirror will decrease.
Solve exercise C4 page 18 Physics 7 Textbook
Problem statement:
A person stands in front of a flat mirror (figure 6.3). Use the method of drawing the image of a point created by the flat mirror to determine which point, M or N, on the wall behind the person can be seen. Explain why it is seen or not seen?
Solution:
Draw the diagram:
After drawing the beams of light successively from N and M to the upper and lower edges of the mirror, we can draw the reflected beams on the mirror and observe that:
- The beam of light coming from N produces a reflected beam on the mirror that does not reach the eye, so the eye does not see point N.
- Similarly, the beam of light coming from M produces a reflected beam on the mirror that reaches the eye, so the eye sees point M.
Concave mirror is an important lesson in Chapter I Optics. Let's check out the hints for solving exercises on pages 22, 23, 24 of Physics 7 textbook to better understand the knowledge.
In Chapter I Optics of Physics 7, students learn about Convex Mirrors. It's essential for students to solve exercises on pages 20, 21 of Physics 7 textbook before class to improve their understanding of Physics 7.
