Quick Light quiz

What does a convex lens do to parallel rays of light?

• Makes them diverge.

• Makes them converge at the principal focus.

• It absorbs light.

• They remain parallel.

What is the focal length of a lens?

• Distance from the lens to the light source.

• Distance from the center of the lens to the principal focus.

• Distance from the lens to the image.

• Distance from the lens to the object.

What kind of images do concave lenses produce?

• No images

• Both real and virtual images

• Virtual images

• Real images

What happens to the direction of a refracted EM wave when it slows down as it crosses the boundary from one substance to another?

• It bends away from the normal.

• It bends towards the normal.

• It does not change direction.

• It reverses direction.

What is the difference between specular and diffuse reflection?

• Both occur on rough surfaces.

• Specular is from a rough surface, diffuse is from a smooth surface.

• Specular is from a smooth surface, diffuse is from a rough surface.

• Both occur on smooth surfaces.

What does a concave lens do to parallel rays of light?

• Makes them converge.

• Makes them diverge.

• They remain parallel.

• It absorbs light.

Why does an object appear opaque?

• It transmits visible light.

• It only absorbs light.

• It does not transmit visible light but absorbs and reflects it.

• It only reflects light.

How do colour filters work?

• By transmitting all wavelengths of light.

• By reflecting all wavelengths of light.

• By absorbing certain wavelengths of light and transmitting others.

• By magnifying certain wavelengths of light.

What properties do all EM waves of the same colour share?

• Same direction.

• Same speed.

• Same wavelength and frequency.

• Same wavelength, frequency and speed

What four things can happen to visible light when it hits an object?

• Transmitted, absorbed, reflected, or refracted.

• Transmitted, absorbed, magnified, or diminished.

• Reflected, refracted, diverged, or converged.

• Absorbed, transmitted, scattered, or focused.