Lenses (physics Only) (GCSE Physics)

A lens produces an image with magnification m = -2. What does this tell you about the image?

A person with myopia (short-sightedness) cannot focus on distant objects. Which corrective lens is used and why?

A diverging (concave) lens always produces an image that is:

A ray of light travelling from air (n ˜ 1.00) into glass with refractive index 1.50 strikes the surface at 30° to the normal. Using Snell’s law, which is closest to the angle of refraction in the glass?

A positive thin lens is used to correct hyperopia (long-sightedness). Where does this lens form the virtual image of a nearby object relative to the eye?

An object 2.0 cm tall is placed 15 cm in front of a converging lens that produces an image 30 cm on the other side. What is the image height?

A student uses the thin lens equation and obtains 1/f = 1/(-20 cm) + 1/(40 cm) and finds f = -40 cm. What type of lens and image does the negative focal length indicate?

Which phenomenon explains why a prism separates white light into colours?

Which ray through a thin lens passes undeviated (in a straight line) through the centre of the lens?

A thin converging lens has a focal length of 10 cm. An object is placed 30 cm from the lens. Using the thin lens equation, what is the image distance?

When light passes from glass (n = 1.5) to air, total internal reflection can occur. Which condition must be true for total internal reflection to be possible?