physics

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SmoggyBass80679

Cards (159)

Light 
A form of energy that enables us to see
Reflection of Light 
Bouncing back of the light to the same medium
Angle of incidence is equal to angle of reflection
The incident ray, reflected ray lies on the same plane
White colour 
When all colours reflect back, it is visible to our eyes
Black colour 
Absence of all colours
Real Images 
The image that can be taken on the screen
Virtual Images 
The image that cannot be taken on the screen, always erect
Concave mirror 
Converging mirror
Convex mirror 
Diverging mirror
Centre of curvature 
The centre of the sphere of which the mirror is a part
Radius of curvature 
The radius of the sphere of which the mirror is a part
Pole 
The centre of the mirror
Principal axis 
The line joining the centre of curvature and pole
Laws of Reflection 
1. When a ray of light is thrown parallel to the principal axis, after reflection it will pass through the focus
2. If a ray of light passes through the focus of the mirror, after reflection it becomes parallel to the principal axis
3. If the light passes through the centre of curvature, after reflection it retraces its path
Focal length 
The distance between the pole and the principal focus of the spherical mirror
Radius of curvature (R) 
2 times the focal length (f)
Concave mirror 
Positive focal length
Positive radius of curvature
Convex mirror 
positive focal length
positive radius of curvature
Dotted lines in convex mirror depict imaginary lines
Ray passing through principal axis 
Concave mirror: Passes through focus
Convex mirror: Becomes parallel to principal axis
Ray passing through focus
Concave mirror: Becomes parallel to principal axis
Convex mirror: Becomes parallel to principal axis
Ray passing through centre of curvature
Concave mirror: Retraces its path
Convex mirror: Retraces its path
Ray passing through oblique
Concave mirror: Forms real image
Convex mirror: Forms virtual image
Concave mirror forming virtual image
Object is between focus and pole
Position of object 
Determines position of image in concave mirror
What is the primary function of the human eye? 
The human eye enables us to see objects around us.
How does the lens in the human eye function?
The lens in the human eye adjusts its curvature to focus light on the retina.
What happens to light as it enters the human eye? 
Light enters the eye through the cornea and is refracted to form an image on the retina.
What is the diameter of the human eyeball?
The diameter of the human eyeball is approximately 2.3 cm.
What role does the iris play in the human eye?
The iris controls the size of the pupil and regulates the amount of light entering the eye.
What is the function of the retina in the human eye?
The retina contains light-sensitive cells that generate electrical signals sent to the brain.
What happens when light-sensitive cells in the retina are activated?
They generate electrical signals that are sent to the brain for interpretation.
What is the least distance of distinct vision for a young adult with normal vision?
The least distance of distinct vision is about 25 cm.
What is the far point of the human eye with normal vision?
The far point is infinity for a normal eye.
What condition occurs when the crystalline lens becomes milky and cloudy?
This condition is called cataract, which can cause partial or complete loss of vision.
Why do humans have two eyes instead of one?
Having two eyes provides a wider field of view and enhances depth perception.
What is the role of the ciliary muscles in the eye?
The ciliary muscles modify the curvature of the eye lens to adjust its focal length.
What is accommodation in the context of the human eye?
Accommodation is the ability of the eye lens to adjust its focal length for clear vision at different distances.
What is myopia also known as?
Myopia is also known as near-sightedness.
How is myopia corrected?
Myopia can be corrected using a concave lens of suitable power.
What is hypermetropia also known as?
Hypermetropia is also known as far-sightedness.