Exercise

A convex lens forms a real and inverted image of a needle at a distance of $40 \mathrm{cm}$ from it. Where is the needle placed in front of the convex lens if the size of the image is equal to that of the object? Also, find the power of the lens.

You look at a coin in a glass beaker. Its real depth is $10 \mathrm{cm}$. Is its apparent depth more than $10 \mathrm{cm}$ or less than $10 \mathrm{cm}$?

Draw a diagram to show what we mean by the angle of incidence and angle of refraction for a refracted ray of light.

A ray of light passes from air into a block of glass. Does it bend towards or away from the normal?

Draw a diagram to show how a ray of light passes through a parallel-sided block of glass or Perspex.

When ray of light passes through a parallel-sided block of glass or Perspex. What can you say about its final direction of travel?Enable GingerCannot connect to Ginger Check your internet connection
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When a ray of light passes from air to glass, is the angle of refraction greater than or less than, the angle of incidence?

Light travels more quickly through water than through glass. Which has the greater refractive index, water or glass?