Laws of Reflection

Q.

State the laws of reflection and describe an experiment to verify them.

Q.

What is the difference between the incident ray and the reflected ray?

Q.

Explain the following terms:

(a) plane mirror

(b) incident ray

(c) reflected ray,

(d) angle of incidence, and

(e) angle of reflection.

Draw diagram/diagrams to show them.

Q.

If the angle of incidence is zero degrees, what is the angle of reflection?

1. 0

2. 90

3. 180

4. 45

Q. The laws of reflection hold good for:

1. Plane mirror only.
2. Concave mirror only.
3. Convex mirror only.
4. All mirrors irrespective of their shapes.

Q.

According to the law of reflection :

(a) i/r = constant

(b) sin i/sin r = constant

(c) i + r = constant

(d) i = r

Q. If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point?
​​​​​​​

1. F

2. R

3. B'

4. B

Q.

A light ray is incident normally on a plane mirror.

(a) What is its angle of incidence ?

(b) What is the direction of reflected ray ? Show it on a diagram.

Q.

The bending of light on passing from one medium to another is called refraction.

1. True
2. False

Q. What is reflection? Write the laws of reflection.

Q. Three slabs are arranged one over the other, as shown in the image. The optical density of the slabs 1, 2 and 3 are a, b, and c respectively. Based on the path of the light, determine the relationship between the optical density of the three slabs.

1. $a>b>c$
2. $a<b<c$
3. $a=b=c$
4. $a<c<b$

Q.

A ray is incident on a plane mirror. Its reflected ray is perpendicular to the incident ray. Find the angle of incidence.

Q. Fig. shows an incident ray $AO$ and the normal $ON$ on a plane mirror. The angle which the incident ray $AO$ makes with the mirror is ${30}^{\circ }$. Draw the reflected ray and then find the angle between the incident and reflected rays.

Q.

What will be the angle of reflection if light falls normally on the reflecting surface?

1. -180^o

2. 180^o

3. 90^o

4. 0^o

Q.

State the laws of Reflection.

Q.

Figure shows an incident ray AO and the normal ON a plane mirror. The angle which the incident ray AO makes with the mirror is ${30}^{\circ }$. (a) Find the angle of incidence. (b) Draw the reflected ray and then find the angle between the incident and reflected rays.

Q. Fig. shows an incident ray $AO$ and the normal $ON$ on a plane mirror. The angle which the incident ray $AO$ makes with the mirror is ${30}^{\circ }$. Find the angle of incidence.

Q. Laws of reflection are valid for spherical mirrors.

Q.

Use the following information to answer the next question.

Two plane mirrors, M₁ and M₂ are placed at a right angle. A ray of light is incident on M₁ at P₁and gets reflected from M₁. It then gets reflected from M₂ at P_2.

If OP₁ = OP₂, then the angle of reflection of the ray at P₂ will be

1. 25°

2. 45°

3. 65°

4. 75°

Q. Assertion :A ray incident along normal to the mirror retraces its path. Reason: In reflection, angle of incidence is always equal to angle of reflection.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q.

When light reflects from two mirrors that meet each other at a right angle, what can be said about the final reflected ray?

1. parallel and same in direction

2. parallel and opposite in direction

3. perpendicular and same in direction

4. perpendicular and opposite in direction

Q.

A ray of light is incident on the plane mirror at a angle as shown in the figure, what is the angle made by the reflected ray to the normal?

1. zero

2. 90°

3. 180°

4. None of these

Q. Choose the correct statement with reference to regular and irregular reflection.

1. Laws of reflection are not followed in irregular reflection.
2. None of the above.
3. Both A and B are correct statements.
4. Laws of reflection are not followed in regular reflection.

Q.

In the given figure, a mirror is arranged at an angle ${30}^{\circ }$ to the square shaped wooden board as shown. Find the angle made by the comb with its reflected shadow. [5 MARKS]

Q.

Use the following information to answer the next question.

Arun has a combination of two plane mirrors, M₁ and M₂. The mirrors are placed at an angle θ with each other, as shown in the given figure.

A light ray is incident on M₁, with the incident angle being 20°.

For what value of , will angle be 30°?

1. 80°

2. 25°

3. 45°

4. 90°

Q.

How does the direction of the ray of light change when it travels directly from denser medium to optically rarer medium?

Q. As per laws of reflection, the angle of incidence is ________ to the angle of reflection.

1. greater than
2. less than
3. proportional
4. equal

Q.

When light enters normally into turpentine oil ($\mu =1.47)$from water, its speed ________ .

Q. Three different arrangements of media are given through which light rays are being passed. If total internal reflection is not happening at any interface, In which of the following will the emergent ray be parallel to the incident ray?

1. None of these
2. 
3. Case 2
4. 

Q. Laws of reflection are applicable even if the incident ray and the reflected ray are in same plane and the normal is in a different plane:

1. False
2. True