Light & Optics MCQs with Answers

The ratio of speed of light in a vacuum to its speed in a specific medium is called?

• A.Refractive index
• B.Optical density
• C.Critical angle
• D.Dispersion coefficient

According to Einstein, increasing the brightness of a beam of light without changing its color will increase:

• A.The wavelength of photons
• B.The energy of each photon
• C.The speed of photons
• D.The number of photons

Which type of waves are used in Night Vision equipment?

• A.Ultraviolet Waves
• B.Radio Waves
• C.Infrared Waves
• D.Microwaves

Past Paper MCQ

The blue colour of the clear sky is due to?

• A.Refraction of light
• B.Reflection of light
• C.Scattering of light
• D.Dispersion of light

Ultra violet light is more likely to cause a photoelectric effect than visible light. This is because photons of ultraviolet light _?

• A.Have a higher energy
• B.Travel faster in vacuum
• C.Have a longer wavelength
• D.Are more abundant in sunlight

Which of the following are electromagnetic waves?

• A.Sound waves
• B.Water waves
• C.Light waves
• D.Seismic waves

The final image formed by a compound microscope is ?

• A.Real and erect
• B.Real and inverted
• C.Virtual and erect
• D.Virtual and inverted

Which of the following is not an example of concave mirror?

• A.Shaving mirror
• B.Dentist's mirror
• C.Security mirror
• D.Makeup mirror

When light strikes an opaque object, the light is blocked, thus a is formed on the opposite side of the object.

• A.Reflection
• B.Image
• C.Shadow
• D.Refraction

Laser stands for light amplification by stimulated emission of radiation. The term "laser amplification" most closely refers to which process?

• A.Splitting light into its constituent wavelengths
• B.Spontaneous emission of photons from excited atoms
• C.Enhancing the light's intensity by resonance
• D.Absorption of photons by ground-state atoms