38 Questions
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.
For a Convex mirror, what kind of images does it produce?
Only Virtual images.
What happens to the image in a Convex mirror as the object moves closer to the mirror?
The image gets bigger.
In which type of mirror will the image be located behind the mirror?
Convex mirror.
Why is a convex mirror used as the door mirror on a car?
Because the convex mirror provides a wide field of view.
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.
What is the formula to calculate focal length, object distance, and image distance?
1/f = 1/u + 1/v
What type of mirror is used by dentists and in floodlights?
Concave mirror
What is the definition of refraction?
The bending of a ray of light when it goes from one medium to another
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
What is the critical angle?
The angle of incidence whose corresponding angle of refraction is 90 degrees
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
What type of lens produces a real and virtual image?
Convex lens
What is the formula to calculate the power of a lens?
Power (P) = 1/f
What is the formula to calculate the combined power of two lenses in contact?
P = P1 + P2
How does the human eye produce a converging system?
The lens alongside the cornea produces a converging system
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
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
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
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
How does the distance of the object from a convex mirror affect the image?
Image size increases as the object approaches the mirror
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
What is the formula to calculate the refractive index of a medium?
Refractive index (n) = real depth/apparent depth
Explain how light behaves when going from a denser to a rarer medium.
Light is refracted towards the normal.
What is the purpose of an optical fibre?
An optical fibre is used to transmit light by total internal reflection.
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.
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.
How do concave lenses affect light rays passing through them?
Concave lenses (diverging) make light rays diverge.
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.
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.
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.
Give two uses for concave mirrors
Torchs, Headlights, Dentist Mirror, Searchlight
What is a use of plane Mirrors
Periscope
What is the name of the dotted line in the attached image
Normal at the point of incidence
What is the name for the angle labelled i in the attached image?
Angle of incidence
Test your knowledge on light basics including its properties, wave phenomena, reflection, and refractive index. Explore the fundamental concepts of light in this quiz.
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