(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

The angle between an incident ray and the mirror is 35⁰.
(i) What is the angle of incidence?
(ii) What is the angle of reflection?
(iii) What is the total angle turned by the ray of light?
(iv) What is the angle between the incident and the reflected rays?

A boy is standing in front of a plane mirror at a distance of 3 m from it.
(i) What is the distance between the boy and his image?
(ii) If the boy moves 1 m backward, find the distance between the image and the boy.

The reflection of a ray of light (OA) normally incident on a plane mirror is shown below

What are the angles of incidence and reflection?

Distinguish between light and sound waves. What are the consequences of the large difference in the speed of sound and that of light? Briefly explain them.

Show an incident ray AO and the normal ON a plan mirror. draw the reflected ray and then find the angle between the incident and reflected rays.

Draw two sets of rays of light to show the formation of an image of the letter as shown in figure p.

State whether the following statement is true or false. If false, correct it.

The angle of incidence is the angle made by the incident ray with the plane mirror.

State whether the following statement is true or false. If false, correct it.

If a ray of light incident on a plane mirror is such that it makes an angle of 30^o with the mirror, then the angle of reflection is 60^o.

State whether the following statement is true or false. If false, correct it.

If the incident ray makes an angle of X^o with the normal, then the reflected ray is 2X^o.

State whether the following statement is true or false. If false, correct it.

The image formed in a plane mirror is the real, erect, and same size as that of the object.

State whether the following statement is true or false. If false, correct it.

The image in a plane mirror is situated in the mirror.

Explain how the principle of echo is used by
The bat during its flight at night

Explain how the principle of echo is used by
The dolphin to locate small fish as its prey.

A person hearing at one end of a long metal bar hears two distinct sounds when the other end is struck with a stone. Explain, giving scientific reasons

What do you mean by the frequency of sound?