Reflection and Refraction of Light

The diagram shows light striking a plane mirror and reflecting.

Which angle is the angle of incidence?

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A shoe shop puts a mirror on the wall so that customers can look at their shoes.

The length of the mirror is 50 cm. A customer has eyes 150 cm above ground level.

The bottom of the mirror is at height $h$ above the ground.

What is the smallest value of $h$ that allows the customer to see an image of his shoes in the mirror?

Options

A   0
B   25 cm
C   50 cm
D   75 cm

A swimming pool is lit by an underwater light.

A ray of light is incident on the surface of the water.

What is the path for the ray of light?

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The diagram shows a ray of light directed at a plane mirror.

What are the angle of incidence and the angle of reflection?

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A ray of light in glass is incident on the surface at an angle $c$. The angle $c$ is the critical angle.

Which diagram shows what happens to the light?

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A ray of light strikes a plane mirror at an angle of incidence of $20^\circ$.

The angle of incidence is then increased by $5^\circ$.

What is the new angle between the incident ray and the reflected ray?

Options

A   $10^\circ$
B   $25^\circ$
C   $45^\circ$
D   $50^\circ$

In which diagram is the path of the light ray not correct?

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A ray of light travels from X to Y along an optical fibre. The angle of incidence at Y is greater than the critical angle.

In which direction does the ray of light travel after reaching point Y?

Options

A   A
B   B
C   C
D   D

Light passes into a transparent material that has a refractive index $n$.

The angle of incidence at the surface of the transparent material is $i$.

Which equation is used to calculate the angle of refraction $r$?

Options

A   $r = n \sin i$
B   $i = n \sin r$
C   $\sin r = \frac{n}{\sin i}$
D   $\sin r = \frac{\sin i}{n}$

Which diagram shows a ray of light that is reflected by a plane mirror?

Options