Laws of Reflection

Q.

A ray of light strikes a plane mirror at an angle of ${40}^{\circ }$ to the mirror surface. What will be the angle of reflection ?

Q.

What happens when a ray of light falls normally (or perpendicularly) on the surface of a plane mirror ?

Q.

What is meant by 'reflection of light'? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram : (a) Incident ray (b) Reflected ray (c) Point of incidence (d) Normal (e) Angle of incidence (f) Angle of reflection

Q.

State and explain the laws of reflection of light at a plane surface (like a plane mirror), with the help of a labelled ray-diagram. Mark the angles of 'incidence' and 'reflection' clearly on the diagram. If the angle of reflection is ${47.5}^{\circ }$, what will be the angle of incidence ?

Q. Question 28
Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be the angle of incidence. Show the same with the help of a diagram.

Q.

Describe an experiment to verify laws of reflection.

Q.

A ray of light is incident on a plane mirror at an angle of ${30}^{\circ }$. What is the angle of reflection?

Q.

What is incident ray?

Q.

A ray of light strikes a plane mirror such that its angle of incidence is ${30}^{\circ }$. What angle does the reflected ray make with the mirror surface?

Q.

A ray of light strikes a plane mirror PQ at an angle of incidence of ${30}^{\circ }$, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is :

(a) ${30}^{\circ }$ (b) ${45}^{\circ }$ (c) ${60}^{\circ }$ (d) ${90}^{\circ }$ Draw a ray-diagram to illustrate your answer.

Q. Two plane mirrors are placed perpendicular to each other. A ray of light strikes the first mirror and after reflection from the first mirror it falls on the second mirror. Assuming that the final reflected ray is in the plane of the incident ray, the final reflected ray emerges:

1. Perpendicular to the original ray
2. Parallel to the original ray
3. At 45 degree to the original ray
4. At 60 degree to the original ray

Q.

The angle between an incident ray and the plane mirror is ${30}^{\circ }$. The total angle between the incident ray and reflected ray will be : (a) ${30}^{\circ }$ (b) ${60}^{\circ }$ (c) ${90}^{\circ }$ (d) ${120}^{\circ }$

Q.

The second law of reflection is valid only for plane mirrors and not for spherical mirrors.

1. True

2. False

Q.

A ray of light is incident on a plane mirror, i being the angle of incidence. What is the deviation suffered by the ray of light? [1 MARK]

Q. What happens when a virtual object is used as an image in convex mirror

Q. Light travels from one point to another in a straight line which is known as ___ propogation of light.

1. Rectilinear
2. Non-Rectilinear
3. Opposite
4. Distinct

Q.

In order to get a diminished and virtual image, the object can be placed anywhere in front of a:

1. all these mirrors

2. Convex mirror

3. Concave mirror

4. Plane mirror

Q.

Find out the angle of deviation after reflection, if the incident ray makes 30⁰ with the normal?

1. 180°

2. 120°

3. 140°

4. 110°

Q.

Fill in the following blank with a suitable word : When light is reflected, the angles of incidence and reflection are ___.

Q. Derivation of mirror formula.

Q.

On a clear day, the sky appears to be more blue towards the zenith (overhead) than it does toward the horizon. This occurs because:

1. the atmosphere is denser higher up than it is at the earth's surface.

2. the temperature of the upper atmosphere is higher than it is at the earth's surface.

3. the sunlight travels over a longer path at the horizon, resulting in more absorption.

4. none of the above is true.

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 shape

Q. a concave mirror is distinguished from a convex mirror using the property of????
1.convergence
2. Divergence
3. Magnification
4. None of these

Q.

Which is the wrong statement out of the following?

1. A convex mirror cannot give a real image.

2. A concave mirror can give a diminished virtual image.

3. A convex mirror can give a virtual image.

4. A concave mirror can give a virtual image.

Q. What is the position of the object in front of a concave mirror for which the image formed cannot be obtained on a screen?

1. At C
2. Between C and F
3. At F
4. Between F and P

Q.

The angle of reflection is equal to the angle of incidence : (a) always (b) sometimes (c) under special conditions (d) never

Q. A convex lens of focal length 15 cm is placed on a plane mirror. An object is placed at 30 cm from the lens. The image will be

Q.

• Which part of the mirror reflects the light?

Q. A ray incident on a plane mirror is reflected in a direction such that the angle between the incident and the reflected ray is 90 degree. What are the angles of incidence and reflection?

Q. For reflection of light, angle of incidence (i) and angle of reflection (r) are related as:

1. i = r
2. i < r
3. i > r
4. i = r = 0