NCERT Class VIII Science Solutions: Chapter 16-Light Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 14:

How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by?

Answer:

Infinite number of images.

Question 15:

Two mirrors meet at right angles. A ray of light is incident on one at an angle of as shown in Fig. Draw the reflected ray from the second mirror.

As Showing in Images is a an Object Situated at a in the Pla …

Answer:

As Showing in Images is a an Object Situated at a in the Pla …

Question 16:

Boojho stands at A just on the side of a plane mirror as shown in Fig. Can he see himself in the mirror? Also can he see the image of objects situated at P, Q and R?

As Showing in Images is a an Object Situated at a in the Pla …

Answer:

Boojho can՚t see his own image because he is not standing in front of the mirror. However, he is able to see objects at P and Q because the rays coming from P and Q get reflected by mirror and reach to his eyes. The ray from object R does not reflect and reaches Boojho, so, he cannot see object R.

As Showing in Images is a an Object Situated at a in the Pla …

Question 17:

  1. Find out the position of the image of an object situated at A in the plane mirror (Fig) .
  2. Can Paheli at B see this image?
  3. Can Boojho at C see this image?
  4. When Paheli moves from B to C, where does the image of A move?
As Showing in Images is a an Object Situated at a in the Pla …

Answer:

  1. The image of the object at position A will be formed behind the mirror. It will be at the same distance away from mirror as the object is.
  2. Yes Paheli at B can see the object because reflected ray from A will reach B.
  3. Boojho can also see the image because his eyes receives the reflected ray from A.
  4. If we trace the reflected rays from B and C backwards, they converge at point behind the mirror. Position of image a remains fixed even if Paheli moves from B to C.
As Showing in Images is a an Object Situated at a in the Pla …

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