light-7

If the Moon is 384 000 km from Earth, the Sun is 150 000 000 km from Earth, and the speed of light is 300000 km/s, calculate the time taken for light to travel from the Moon to the Earth.

• 1.28s

• 1.2 minutes

• 1.5s

• 500 second

What is meant by monochromatic light?

• Red light

• Refraction

• Single wavelength light

• Reflection

A man stands 10 m in front of a large, plane mirror. How far must he walk before he is 5 m away from his image?

• 10 m

• 7.5 m

• 5 m

• 2.5 m

What is the critical angle for glass?

• 41°

• 45°

• 29°

• 49°

What is the spreading effect called when white light passes through a prism?

• Dispersion

• Refraction

• Reflection

• Diffraction

Which colour is deviated most by a prism?

• Red

• Green

• Blue

• Violet

Which colour is deviated least?

• Red

• Green

• Blue

• Violet

Calculate the speed of light in water. (Refractive index is 1.33)

• 200 000km/s

• 225 000km/s

• 150 000 km/s

• 300 000 000 m/s

What phenomenon occurs when light changes speed as it passes from one medium to another?

• Refraction

• Reflection

• Diffraction

• Dispersion

Which colour has the shortest wavelength in the visible spectrum?

• Red

• Green

• Blue

• Violet