Physics

Light and Mirrors

454 Questions

Light and mirrors questions cover the principles of reflection, image formation, and mirror magnification. Concepts include the properties of plane mirrors, the uses of concave mirrors in solar devices, and the behavior of light rays. These fundamentals are essential general science topics in major competitive examinations.

Plane mirror propertiesConcave mirror applicationsMirror magnification formulaLight reflection lawsImage formation

Light and Mirrors Questions

Multiple choice physics observing space: telescopes optical instruments : telescope the reflecting telescope optical telescope xx radio telescope and space telescopes

In which of the following instruments is the final image virtual?

  1. Projector

  2. Camera

  3. Microscope

  4. Telescope
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

The final image of the camera and projector is real because it is obtained or projected on a screen or a photographic film or a chip.

A simple microscope uses convex lens and the object is placed between the focus and the optical center, so that, an erect, virtual and enlarged image of the object is formed.

A telescope uses two co-axially placed convex lenses in such a way that the focus of objective lens is past the focus of the eye piece. The first lens or the objective lens produces a real and inverted image of the object to be observed and this real image formed acts as an object for the eye piece convex lens and is between the focus and the optical center, so that, an inverted, virtual and enlarged image of the object is formed.

Hence, the correct answers are OPTIONS C and D.  

Multiple choice evs magic with mirrors dual nature of light nature and sources of light theories on light

A small plane mirror is placed at the center of the spherical screen of radius R. A beam of light is falling on the mirror. If the mirror makes n revolutions per second, the speed of light on the screen after reflection from the mirror will be:

  1. $4\pi nR$
  2. $2\pi nR$
  3. $nR/2\pi$
  4. $nR/4\pi$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a mirror rotates at n revolutions per second, the reflected beam rotates at 2n revolutions per second. The spot on the screen moves at a speed of v = omega * R = (2 * pi * 2n) * R = 4 * pi * n * R.

Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

Which is the wrong statement out of the following?

  1. A concave mirror can give a virtual image.

  2. A convex mirror can give a virtual image.

  3. A concave mirror can give a diminished virtual image.

  4. A convex mirror cannot give a real image.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The properties of image formed for different object distance are listed below:
Concave mirror:
1)u<f----virtual image , enlarged.
2)f,u,2f---Real, inverted, magnified.
3)u>2f----Real, inverted, diminished.
Convex mirror:
for any object distance virtual,errect and enlarged image.

Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

Dentist's mirror is ...........

  1. Concave mirror

  2. Convex mirror

  3. Plane mirror

  4. Convex lens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$ \bf{Concave\ mirrors} $ are used by dentists because at a short range (object distances less than the focal length of the mirror) they produce enlarged, erect and virtual images. It is useful to have a magnified image of a tooth when repairing cavities, cracks, or other abnormalities.

Hence, the correct answer is OPTION A.

Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

Name the type of mirror used as a shaving mirror

  1. Concave mirror

  2. Convex mirror

  3. Plane mirror

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Concave mirror is used as shaving mirror. This is because it produces a virtual, erect and magnified image of our face when held in front of the face at a distance less than its focal length thus, allowing us to observe our face closely.

Hence, the correct answer is OPTION A. 
Multiple choice physics reflection of light at curved surfaces uses of curved mirrors uses of spherical mirror uses of spherical mirrors

Use of concave mirrors:

  1. for examining internal parts of ear, nose, mouth by physicians

  2. to focus sunlight to produce heat in solar furnaces

  3. as reflectors in headlights of vehicles, torch light to produce strong parallel beam of light

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Concave mirrors help to produce large image helps doctors to examine body parts and also are used to auto mobile mechanics to produce strong parallel beam of light during night. Concave mirrors are used to focus sunlight to produce heat from solar furnaces.