Question 20 (a)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.

How many mirrors should he use to see the objects?

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Solution

He should use three plane mirrors to see the objects.

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Question 20 (b)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.

Indicate the positions of the mirrors in the figure.

Question 20 (c)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.

What must be the angle with respect to the incident light at which he should place the mirrors?

Question 20 (d)

Boojho planned an activity to observe an object A through pipes as shown in the figure, so that he could see objects which he could not directly see.

Indicate the direction of rays in the figure.

Question 20 (e)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see. At each corner a plane mirror is placed at 45 degrees in order to deviate the light rays by 90 degrees.

If any of the mirrors is removed, will he be able to see the objects?

Q. A person who used a concave lens saw an image. without specs, he couldn't see an image clearly which was far away. If we place a mirror closer to him he could see a mirror (object) but he can not see an image(at a long distance) which was reflected by a mirror.Why he could not see an image clearly even though the mirror was closer to him. ?

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Range of Visibility and Uses of a Plane Mirror

Standard IX Physics

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Question 20 (a) Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see. How many mirrors should he use to see the objects?

He should use three plane mirrors to see the objects.

Question 20 (a)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see.

How many mirrors should he use to see the objects?