Light & Optics MCQs with Answers

Which one is correct about laser light?

• A.Monochromatic
• B.Polychromatic
• C.Incoherent
• D.Divergent

The refractive index of the ice is _?

• A.1.52
• B.1.33
• C.1.31
• D.1.00

Which of the following is responsible for the sun's color changes at different times of the day?

• A.Refraction by water droplets
• B.Reflection by clouds
• C.Scattering by dust and air molecules
• D.Absorption by ozone layer

A _ is an instrument with the help of which we can see the objects higher than the level of our eyes.

• A.Kaleidoscope
• B.Telescope
• C.Microscope
• D.Periscope

Light propagates through space as a wave is evident by all of the following EXCEPT?

• A.Diffraction
• B.Interference
• C.Photoelectric effect
• D.Polarization

Instrument used to measure relative abilities of pigments to absorb different wavelengths of light is _?

• A.Spectroscope
• B.Spectrophotometer
• C.Colorimeter
• D.Photometer

Which colour has largest wavelength in the spectrum of white light?

• A.Violet
• B.Red
• C.Green
• D.Blue

Which of the following surfaces gives diffused reflection?

• A.Mirror
• B.Still water surface
• C.Roadway
• D.Polished metal

If an opaque object is moved further away from the light source, the shadow gets _?

• A.Smaller
• B.Larger
• C.Darker
• D.Remains the same

The angle of incidence of a ray for which the angle of refraction is 90° is called ?

• A.Critical Angle
• B.Angle of Reflection
• C.Angle of Deviation
• D.Brewster's Angle