Reflection, Refraction and Total Internal Reflection

An image is formed in a plane mirror. Which statement must be correct?

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The diagram shows two divergent rays of light from an object O being reflected from a plane mirror. At which position is the image formed?

• A

• B

• C

• D

The diagram shows the image of a clock in a plane mirror.

What time is shown?

• 02:25

• 02:35

• 09:25

• 09:35

The diagram shows a ray of light incident on the surface of a glass block.

The ray of light is partially reflected back into the air and partially refracted into the glass block.

Which row correctly identifies the angle of reflection and the angle of refraction?

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A ray of red light enters a semi-circular glass block normal to the curved surface. Which diagram correctly shows the partial reflection and refraction of the ray?

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A ray of light meets the face of a glass block at an angle of 30° as shown.

The refractive index of the glass is 1.5.

What is the angle of refraction r inside the glass block?

Show the working, and encircle the answer.

Which conditions are necessary for light to be totally internally reflected?

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The diagram shows a narrow beam of light incident on a glass-air boundary. Some of the light

emerges along the surface of the glass and some is reflected back into the glass.

Which row is correct?

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A student draws four diagrams to represent light passing from air through a glass block and then back into the air.

The critical angle for the glass is 42°.

In which diagram is the path of the light through the glass block not correct?

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