Light & Optics MCQs with Answers

To illuminate the inaccessible places in the tooth, dentists use ?

• A.Concave mirror
• B.Convex mirror
• C.Plane mirror
• D.Convex lens

Past Paper MCQ

What is the composition of the inner core of an optical fibre?

• A.Silver or Gold
• B.Copper or Aluminium
• C.Steel or Iron
• D.Glass or Plastic

Past Paper MCQ

What color is observed when the sunlight's spectrum, which is a mixture of different colors, is combined?

• A.Yellow
• B.White
• C.Black
• D.Blue

Refractive index of materials is approximately equal to the square root of _?

• A.Electrical resistivity × Magnetic susceptibility
• B.Electrical conductivity × Magnetic flux
• C.Electrical permittivity × Magnetic permeability
• D.Dielectric constant × Magnetic moment

Brewster's angle is related to?

• A.Dispersion of light
• B.Refraction of sound
• C.Diffraction of waves
• D.Polarization of light

What is the maximum resolution power of a light microscope as compared to the naked eye?

• A.500 times
• B.1000 times
• C.2000 times
• D.100 times

Which is an optical instrument?

• A.Telescope
• B.Stethoscope
• C.Barometer
• D.Thermometer

Consider: radio waves (r), visible light (v), infrared light (i), x-rays (x), and ultraviolet light (u). In order of increasing frequency, they are:

• A.r, i, v, u, x
• B.r, v, i, x, u
• C.x, u, v, i, r
• D.i, r, v, x, u

In a diffraction experiment, the apparatus is moved away from the screen so that plane wavefronts are obtained. This describes ?

• A.Fresnel diffraction
• B.Fraunhofer diffraction
• C.Rayleigh scattering
• D.Bragg diffraction

Which of the following objects that do not allow light to travel through them are called?

• A.Transparent
• B.Translucent
• C.Opaque
• D.Reflective