Light is what kind of wave?
- amechanical
- belectromagnetic
- clongitudinal sound
- dmatter
103 questions · 20 sections
Light is what kind of wave?
Range of visible light wavelength is?
Visible color of shortest wavelength is?
Electromagnetic wave with wavelength just less than visible violet is?
Which radiation comes out from radioactive nucleus?
Wavelength just larger than longest visible wavelength corresponds to?
Order of wavelengths from smallest to largest in EM spectrum is?
CD reflects sunlight as full spectrum because?
TV remote emits which type of wave?
Light-sensitive IC in mobile phone camera that can detect some infrared with visible light is?
As wavelength of visible light increases starting from violet, color order is?
Trillion in as used in textbook?
When light goes from one medium to another, three phenomena occur simultaneously. They are?
Light wave consists of?
Light requires which medium to travel?
When light passes from one medium to another, the part that enters the second medium is called?
Perpendicular drawn at the point where light strikes a surface is called?
Angle between incident ray and normal is?
Second law of reflection states?
According to first law of reflection, the reflected ray lies?
From front surface of normal glass, approximate percentage of light reflected at small angle is?
According to Fresnel's law, larger the angle of incidence?
White light contains?
A red rose appears red because it?
A red rose viewed under pure green light appears?
A green leaf viewed under pure red light appears?
The color of an object is determined by?
Parallel rays after reflecting from a smooth mirror remain?
Reflection from a rough surface that scatters rays in different directions is called?
In irregular reflection from a rough surface, each individual ray still obeys?
Metal layer placed behind glass of an ordinary mirror is for?
Approximate percentage of light reflected by back metal coating of an ordinary glass mirror is?
In telescopes, silver/aluminium is coated on the front of the glass surface to?
Which describes the image formed in a plane mirror?
Image of an object in a plane mirror is at a distance behind the mirror equal to?
Why is the image in a plane mirror called virtual?
A real image differs from a virtual image because?
Minimum length of a plane mirror needed to see a full-length image of yourself is?
Required length of plane mirror to see full-length image depends on?
When an object is placed between two parallel mirrors, the number of images formed is?
After two successive reflections in two perpendicular plane mirrors, your left hand image appears as?
Two plane mirrors set at 60° angle. Light strikes first mirror at 60° incident angle. After reflection in both mirrors, the final ray travels?
Image formed by a pinhole camera is?
In a kaleidoscope, beautiful patterns are produced because of?
Two types of spherical mirror are?
A spherical mirror is made by cutting a portion of a?
The convex (outer) side of a shiny spoon acts as which type of mirror?
When parallel rays strike a convex mirror, after reflection they?
Center point of the reflecting surface of a spherical mirror is called?
Distance from the pole to the focal point is called?
Relation between focal length and radius of the sphere for a spherical mirror?
If a plane mirror is treated as a spherical convex mirror, its focal length is?
A ray heading toward the center of curvature of a convex mirror, after reflection?
A ray parallel to principal axis, after striking a convex mirror?
A ray directed toward the focus of a convex mirror, after reflection?
Image in a convex mirror is always?
Position of image in a convex mirror is?
As an object moves farther from a convex mirror, the image?
The concave (inner) side of a shiny spoon acts as which type of mirror?
Parallel rays incident on a concave mirror, after reflection?
Before reaching the focal point, rays reflected from a concave mirror are?
After passing through the focal point, the same rays become?
Focal length of a plane mirror considered as a concave mirror is?
A ray going along the radius (from the center of curvature) on a concave mirror reflects?
A ray parallel to the principal axis on a concave mirror, after reflection, passes through?
A ray that goes through the focus before striking a concave mirror, after reflection?
Object placed within the focal length of a concave mirror produces an image that is?
Object placed exactly at the focal point of a concave mirror, image forms?
Object placed between focus F and center of curvature C of a concave mirror, image is?
Object placed exactly at the center of curvature of a concave mirror, image is?
Object placed beyond the center of curvature of a concave mirror, image is?
Mirror formula relating object distance u, image distance v and focal length f is?
Consider these statements about a concave mirror:
Magnification refers to?
If is the length of the object and is the length of the image, magnification equals?
Telescope's magnification refers to?
Rear-view mirror in front of a vehicle's driver is which type?
Reason for using a convex mirror as rear-view mirror is?
Mirror used in the largest telescopes is?
Larger concave mirror is used in telescopes mainly because?
In searchlights and torches, the light bulb is placed at?
Reason for placing the source at the focal point of concave mirror in searchlight?
Doctors and dentists use which type of mirror to obtain a magnified erect image?
At sharp 90° turns of hilly roads to help drivers see oncoming traffic, which mirror is placed?
Where are convex mirrors used?
How many types of reflections are there?
Image produced in a plane mirror —
In figure 8.30 (concave mirror with virtual upright image behind it formed from object BO between focus and pole), what will be the size of the image?
In figure 8.30, what is the position of the object BO?
Which best defines an image?
Why does a ray incident perpendicularly on a mirror return along the same path?
According to the law of reflection, if the angle of incidence is , then angle of reflection is?
Image formed in a plane mirror PQ is virtual because?
Magnification is defined as the ratio of?
Plane mirrors are not used as rear-view mirrors because?
A 2 cm stick is placed before a concave mirror; the image formed on a screen has magnification 3.51. The length and nature of the image are?
In the next step magnification rises from 3.51 to 6 with the image still on the screen. What change was made?
Reflection of light means?
Why do leaves appear black in dim light?
Which best describes a real image?
A ray incident perpendicularly on a mirror reflects back along the same path because?