Tag: option c: imaging

Quizzes (13) Questions (113)

Questions Related to option c: imaging

Multiple choice physics option c: imaging the mirror formula derivation of formula for curved mirrors mirror formula and magnification

In case of a virtual and erect image, the magnification created by the mirror is

  1. positive

  2. negative

  3. unity

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

Magnifaction of a mirror is defined as
$m=\dfrac{size of image}{size of object}$
and since, in case of virtual and errect image, size of image and object both are positive  . Hence magnification created by mirror is positive.

Multiple choice physics option c: imaging the mirror formula derivation of formula for curved mirrors mirror formula and magnification

In case of a real and inverted image, the magnification created by the mirror is

  1. positive

  2. negative

  3. unity

  4. infinity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnification of image created by mirror is defined as
$m=\dfrac{size of image}{size of object}$
and in case of inverted image. Size of image is negative whereas size of object is positive. Hence , magnification produced is negative and it can be unity when object is placed at center of curvature and infinity when object is at focus.

Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

Light of different colours propagates through air :

  1. with velocity of air

  2. with different velocity

  3. with velocity of sound

  4. with equal velocity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The velocity of the light does not change in air it will be equal for all the colours
  • If there may some other medium like water etc velocity will be changed
  • But it remains equal in air
  • Hence the option D is the right answer
Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

In an optical fibre during transmission of light

  1. Energy increases.

  2. Energy decreases.

  3. No loss of propagation of energy takes place.

  4. Light partially reflects and refracts.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Attenuation is a gradual loss int he intensity of any kind of flux through a medium .in telecommunication the attenuation affect the propagation of waves and signals. so during transmission of light through  an optical fiber optical and electrical attenuators cause the loss in transmission.

Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

Which principle is the basis for the transmission of light through fiber optic cables even if the cable is bent?

  1. Photoelectric effect

  2. Uncertainty principle

  3. Light diffraction

  4. Light polarization

  5. Total internal reflection
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Optical fibres are used to transmit light from one place to another along curved path so it does not matter even if the cable is bent.Optical fibre transmission is based on phenomenon of total internal reflection .We must remember that optical fibre does not bend light, instead light follows a zig-zag path.

Multiple choice physics option c: imaging fibre optics basics optical fibre the critical angle, total internal reflection and optical fibre

A cutted diamond sparkles because of its:

  1. high refractive index

  2. hardness

  3. emission of light by the diamond

  4. absorption of light by the diamond
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A cutted diamond sparkles because of its high refractive index. Because of high refractive index, the light suffers total internal reflections many times. that is why it sparkles.