OPTICS-1

Aisha is conducting a thrilling experiment with a laser beam! If the angle of incidence, θi = 0°, what do you think the angle of reflection, θr, will be? Let's find out!

• 0°

• 90°

• 180°

• 45°

Answer explanation

According to the law of reflection, the angle of incidence equals the angle of reflection. Since θi = 0°, θr must also be 0°. Therefore, the correct answer is 0°.

During a thrilling science experiment, Ishaan, Avani, and Kavya are exploring the fascinating world of laser beams! They wonder, what do we call the angle formed between the incident ray and the normal to the reflecting surface? It's known as ___________________.

• angle of incidence

• angle of reflection

• angle of refraction

• angle of dispersion

Answer explanation

The angle formed between the incident ray and the normal to the reflecting surface is called the angle of incidence. This is a fundamental concept in optics, distinguishing it from reflection and refraction.

Myra and Ishaan are having a fun science experiment in their room with a flashlight! They shine the light towards a shiny plane mirror, and they notice that the angle of reflection is 50°. Can you help them calculate the angle between the incident ray and the reflected ray?

• 0°

• 25°

• 50°

• 100°

Answer explanation

The angle of reflection is equal to the angle of incidence. Since the angle of reflection is 50°, the angle of incidence is also 50°. The angle between the incident ray and the reflected ray is 50° + 50° = 100°.

Ria is having a blast playing with her laser pointer, aiming it at a shiny mirror. Can you help her figure out the magic of reflection? According to the laws of reflection,

• angle of incidence = angle of reflection

• angle of incidence > angle of reflection

• angle of incidence < angle of reflection

• angle of incidence ≠ angle of reflection

Answer explanation

According to the laws of reflection, the angle at which the light hits the mirror (angle of incidence) is equal to the angle at which it reflects off (angle of reflection). Therefore, the correct choice is: angle of incidence = angle of reflection.

During a fun science experiment, Aashi was playing with a shiny mirror-like surface in class. She was fascinated to see that when light hit the surface, most of it bounced back into the same medium. This cool phenomenon is known as ______________________.

• reflection of light

• refraction of light

• dispersion of light

• deviation of light

Answer explanation

The phenomenon where light bounces back into the same medium when it hits a shiny surface is called reflection of light. This is why Aashi observed most of the light returning instead of passing through.

In her exciting physics class, Aanya, along with her friends Vanya and Kiara, is exploring the fascinating world of light! They discover that we can see objects because of ___________.

• reflection

• refraction

• total internal reflection

• diffraction

Answer explanation

We can see objects because of reflection, which occurs when light bounces off surfaces and enters our eyes, allowing us to perceive them. Other options like refraction and diffraction involve bending or spreading of light, not direct visibility.

During a fascinating science class, Eshaan and Avni are conducting an experiment with a mirror. They observe some intriguing statements: 1. The incident ray, normal, and reflected ray all lie in one plane. 2. The angle of incidence (i) is equal to the angle of reflection (r). Can you help them figure out what this phenomenon is called?

• reflection

• refraction

• total internal reflection

• dispersion

Answer explanation

The phenomenon described is called reflection. It occurs when the incident ray, normal, and reflected ray lie in the same plane, and the angle of incidence equals the angle of reflection.

Vanya is conducting a fascinating experiment with light and is eagerly observing a diagram. Can you guess what 'Q' indicates in the diagram?

• Incident ray

• Refracted ray

• Reflected ray

• Normal

Answer explanation

In the diagram, 'Q' represents the reflected ray, which is the light ray bouncing off a surface. This is distinct from incident and refracted rays, making 'reflected ray' the correct choice.

Riyaan and Dia are conducting a fun experiment with a shiny mirror, and they are fascinated by how light behaves! They come up with some interesting statements about the laws of reflection: (i) The incident ray, normal ray, and the reflected ray all lie in the same plane. (ii) The angle of reflection is always equal to the angle of incidence. (iii) The angle of incidence is equal to the angle formed by the normal ray. (iv) The angle of reflection is equal to 90°.

• Both (i) and (ii)

• Both (ii) and (iii)

• Both (iii) and (iv)

• (i), (ii) and (iv) are correct

Answer explanation

Statements (i) and (ii) are correct as they describe the laws of reflection accurately. Statement (iv) is incorrect because the angle of reflection is not always 90°. Therefore, the correct choice is (i), (ii) and (iv) are correct.

Aarav and Sanya are conducting a thrilling experiment with a laser beam. Can you help them figure out the angle between the incident ray and the normal, known as ___________?

• angle of abnormality

• angle of refraction

• angle of incidence

• angle of reflection

Answer explanation

The angle between the incident ray and the normal is called the angle of incidence. This term specifically refers to the angle at which the incoming ray strikes the surface before reflection or refraction occurs.