Ray Model of Light (Sec 1)

The law of reflection states that the angle of incidence is _____ to the angle of reflection.

Which of the following options about light is true?

• 1. Light travels in a straight line.

• 1. Light can only reflect on smooth surfaces.

• 1. Light follows the law of energy conservation.

• 1. The speed of light is 3×10⁸ m/s in vacuum.

______ mirrors produce images that are smaller than the object, upright and virtual.

What are the characteristics of an image in a plane mirror?

• 1. Diminished, upright, real

• 1. Enlarged, upright, virtual

• 1. Same size, upright, real

• Same size, upright, virtual

Refraction refers to the _______ of light

Which of the following statements about refraction is correct?

• Refraction can occur between two mediums of identical optical densities.

• Only light experiences refraction.

• When a light ray travel from air to glass, it refracts towards the normal.

• In refraction, the speed of light does not change.

White light is made up of _____ colours.

Which statement about the dispersion of light is true?

• 1. Dispersion of light is the separation of white light into seven different colours.

• Lights of different colours travel at the same speed inside the prism.

• Dispersion of light can only happen when white light passes through a glass prism.

• After light is dispersed into the seven different colours, we can pass it through another prism to get seven more colours.

What are some uses of infrared radiation?

• light bulbs

• thermal imaging

• suntanning

• remote controls

• electric heaters

Prolonged exposure to Ultraviolent (UV) radiation can cause ______.

• sunburn

• headaches

• skin cancer

• premature ageing

• vision loss