Light SAQ

What is the definition of reflection in terms of light?

The bouncing of light off an object.

Explain the concept of Diffuse Reflection.

It is the reflection of light off a rough surface in which it is scattered in all directions.

What is the condition for forming a real image?

Actual intersection of light rays.

What do Concave mirrors produce?

Real and Virtual images. Signup and view all the answers

For a Convex mirror, what kind of images does it produce?

Only Virtual images. Signup and view all the answers

What happens to the image in a Convex mirror as the object moves closer to the mirror?

The image gets bigger. Signup and view all the answers

In which type of mirror will the image be located behind the mirror?

Convex mirror. Signup and view all the answers

Why is a convex mirror used as the door mirror on a car?

Because the convex mirror provides a wide field of view. Signup and view all the answers

Explain Law 1 of reflection of light.

The incident ray, the normal at the point of incidence, and the reflected ray all lie in the same plane. Signup and view all the answers

What is the formula to calculate focal length, object distance, and image distance?

1/f = 1/u + 1/v Signup and view all the answers

What type of mirror is used by dentists and in floodlights?

Concave mirror Signup and view all the answers

What is the definition of refraction?

The bending of a ray of light when it goes from one medium to another Signup and view all the answers

What is Snell's Law?

The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for two given media Signup and view all the answers

What is the critical angle?

The angle of incidence whose corresponding angle of refraction is 90 degrees Signup and view all the answers

What is the name of the telecommunication technology based on the principal of total internal reflection?

Optical fibres A very thin transparent rod (usually of glass) through which light can travel by total internal reflection Signup and view all the answers

What type of lens produces a real and virtual image?

Convex lens Signup and view all the answers

What is the formula to calculate the power of a lens?

Power (P) = 1/f Signup and view all the answers

What is the formula to calculate the combined power of two lenses in contact?

P = P1 + P2 Signup and view all the answers

How does the human eye produce a converging system?

The lens alongside the cornea produces a converging system Signup and view all the answers

What is the formula for refractice index of a medium using sin and/or cos?

Sin(i)/Sin(r) Ratio of sine of angle of incidence to sine of angle of refraction, calculated from vacuum into that medium Signup and view all the answers

What is the difference between real and virtual images, and how are they formed?

Real images form due to actual intersection of light rays, virtual images form by apparent intersection Signup and view all the answers

State the two laws of reflection of light, and explain their significance.

Incident ray, normal, and reflected ray lie in same plane; angle of incidence equals angle of reflection Signup and view all the answers

What happens to the image in a concave mirror when the object is outside the focus?

Real image formed, located in front of the mirror Signup and view all the answers

How does the distance of the object from a convex mirror affect the image?

Image size increases as the object approaches the mirror Signup and view all the answers

What is the difference between regular and diffuse reflection, and how do they occur?

Regular reflection occurs on smooth surfaces, diffuse reflection occurs on rough surfaces Signup and view all the answers

What is the formula to calculate the refractive index of a medium?

Refractive index (n) = real depth/apparent depth Signup and view all the answers

Explain how light behaves when going from a denser to a rarer medium.

Light is refracted towards the normal. Signup and view all the answers

What is the purpose of an optical fibre?

An optical fibre is used to transmit light by total internal reflection. Signup and view all the answers

Describe Snell's Law.

Snell's Law states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant for two given media. Signup and view all the answers

What type of mirror is used in supermarkets and cars to provide a wide field of view?

Convex mirrors are used in supermarkets and cars to provide a wide field of view. Signup and view all the answers

How do concave lenses affect light rays passing through them?

Concave lenses (diverging) make light rays diverge. Signup and view all the answers

Explain the functioning of a concave mirror with regard to image formation when the object is inside the focus.

In a concave mirror, if the object is inside the focus, the image formed is virtual and located behind the mirror. Signup and view all the answers

Describe the difference in image formation between a concave lens and a convex lens.

Concave lenses produce only virtual images, while convex lenses can produce both real and virtual images. Signup and view all the answers

What is the significance of the critical angle in optics?

The critical angle is the angle of incidence at which the refracted ray is 90 degrees, leading to total internal reflection. It is crucial for understanding phenomena like optical fiber communication. Signup and view all the answers

Give two uses for concave mirrors

Torchs, Headlights, Dentist Mirror, Searchlight Signup and view all the answers