Light & Optics MCQs with Answers

The energy of an X-ray photon having wavelength of 3 × 10⁻¹⁰ m is:

• A.6.63 × 10⁻¹⁶ J
• B.6.63 × 10⁻¹⁸ J
• C.6.63 × 10⁻²⁰ J
• D.6.63 × 10⁻¹⁴ J

Mirage is an example of _?

• A.Refraction of light
• B.Total internal reflection of light
• C.Dispersion of light
• D.Diffraction of light

Light travels fastest in _?

• A.Glass
• B.Air
• C.Water
• D.Vacuum

What is the term for the change in direction of a propagating wave, such as light or sound, when it passes from one medium to another with a different velocity?

• A.Reflection
• B.Refraction
• C.Diffraction
• D.Dispersion

When light is reflected from a plane mirror at 30°, it will reflect at ?

• A.30°
• B.60°
• C.90°
• D.15°

The refractive index of diamond is ?

• A.1.52
• B.2.00
• C.1.33
• D.2.42

A device based on photoelectric effect is called?

• A.Transistor
• B.Thermistor
• C.Capacitor
• D.Photo diode

The index of refraction depends on

• A.the amplitude of light
• B.the wavelength of light
• C.the frequency of light
• D.the speed of light

The penetrating power of X-rays depends on their ?

• A.Frequency
• B.Wavelength
• C.Amplitude
• D.Velocity

In the past, how was solar energy concentrated to produce heat?

• A.Using plane mirrors and concave lenses
• B.Using spherical mirrors and lenses
• C.Using photovoltaic cells
• D.Using parabolic antennas