Question 5

A small hole P is made in a piece of cardboard. The hole is illuminated by a touch as shown in the figure. The pencil of light coming out of the hole falls on a mirror.

At which point should the eye be placed, so that the hole can be seen?

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Solution

Eye should be placed at A because the hole can be seen only, when the angle of incidence is equal to the angle of reflection.

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Question 5 A small hole P is made in a piece of cardboard. The hole is illuminated by a touch as shown in the figure. The pencil of light coming out of the hole falls on a mirror. At which point should the eye be placed, so that the hole can be seen?

Eye should be placed at A because the hole can be seen only, when the angle of incidence is equal to the angle of reflection.

Question 5

A small hole P is made in a piece of cardboard. The hole is illuminated by a touch as shown in the figure. The pencil of light coming out of the hole falls on a mirror.

At which point should the eye be placed, so that the hole can be seen?