Light Energy

A smooth shining surface, which rebounds the light in the same or in different directions, is called_____________.

• a mirror

• a lens

• reflection of light

• point of incidence

Beam of light striking a reflecting surface is called_____________.

• reflecting ray

• incident ray

• refracted ray

• normal ray

Band of seven colours is called _____________.

• VIBGYOR

• spectrum

• dispersion

• reflection

In case of reflection of light, the relationship between angle of incidence (i) and the angle of reflection (r) may be expressed as:

• i = r

• i < r

• i > r

• undetermined

What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

• 60°

• 45°

• 90°

• 180°

The splitting of white light into its seven constituent colours is called_____________.

• refraction

• dispersion

• deviation

• reflection

If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?

• 90°

• 60°

• 30°

• 0°

When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This phenomenon is called:

• directional contradiction

• lateral inversion

• lateral projection

• illusory image

Rainbow is a natural phenomenon showing _____________.

• reflection

• deflection

• dispersion

• diversion

Which of the following is not a luminous object?

• Sun

• Candle

• Moon

• Tube light