Light and Optical Systems: More Practice

Reflection, refraction, lenses, the visible spectrum, and how a pinhole camera forms an image.

8 questions, free, marked as you go with a worked explanation on every one.

What this covers

According to the law of reflection, how does the angle of incidence compare to the angle of reflection?
When light passes from air into glass, what happens to its speed?
Which type of lens is thicker in the middle than at the edges?
A concave mirror has a focal length of 10 cm. An object placed very far away forms its image at the focal point. How far from the mirror does that image form, in centimetres?
Use the table below, giving the approximate wavelength of four colours of visible light. Which colour has the longest wavelength?
White light passing through a prism separates into the colours of the spectrum. What causes this?
Light travels at about 3 × 10⁸ metres per second in a vacuum. How many seconds does it take to travel 900,000,000 metres?
A pinhole camera forms an image of the scene in front of it. How does that image appear?