Lenses (physics Only) (GCSE Physics)

A beam of red light and a beam of blue light enter a glass prism at the same angle. Which statement is true about their angles of refraction in the glass?

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?

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

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?

A thin lens produces a real image at 40 cm from the lens on the image side for an object placed 20 cm on the object side. What is the focal length?

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

An object is placed 5 cm in front of a lens whose focal length is 10 cm. The image distance computed by thin lens equation is negative. Which best describes the image?

Which ray rule is correct when drawing ray diagrams for a thin converging lens?

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?

Why do simple eyeglass lenses suffer from chromatic aberration (colours focusing at different distances)?

A monochromatic light beam strikes a glass–air boundary from inside the glass. The critical angle for the glass–air interface is 42°. If the angle of incidence inside the glass is 50°, what happens?