All Solutions

Exercise 7

Step 1

1 of 3

The height of the point of reflection will increase.

Step 2

2 of 3

If the distance of the observer from the base is $2d$, then we have

$$
frac{h}{4d}=frac{y}{3d}
$$

$$
y=frac{3}{4}h
$$

Since $3/4>2/3$, the height of the point of reflection increases.

Result

3 of 3

The point of reflection increases.

Exercise 8

Step 1

1 of 2

The image distance from the mirror will also reduced by $1.1$ m/s., So the velocity between student and his image will be $2times 1.1=2.2$ m/s

Result

2 of 2

2.2 m/s

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