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Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d075f59b460d7261f2f6.jpg' /> Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. Let us assume that mirrors are placed at the turns so that he can see the object. If any of the mirrors is removed, will he be able to see the objects?

Question 4 :
What is the angle of incidence of a ray if the reflected ray is at an angle of $90^{\circ}$ to the incident ray?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0ddf59b460d7261f37a.JPG' /> From the above image, When Paheli moves from B to C, where does the image of A move?

Question 6 :
An image formed by a mirror the left of the object appears on the right and the right appears on the left. This is known as _______________ ?

Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d078f59b460d7261f2fa.jpg' /> Boojho planned an activity to observe an object A through pipes as shown in the above figure, so that he could see objects which he could not directly see. How many mirrors should he use to see the objects?

Question 8 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0fbf59b460d7261f3a1.PNG' /> Refer to the above figure. Can Paheli at B see the position of the image of an object situated at A in the plane mirror ?

Question 9 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Mirror?

Question 10 :
The objects which shine in the light of other objects are called illuminated objects. Is it TRUE OR FALSE?

Question 11 :
Suppose you are in a dark room. Can you see objects OUTSIDE the room?

Question 12 :
Where does the lens of our eye form the image of an object?

Question 13 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d073f59b460d7261f2f3.jpg' /> Boojho planned an activity to observe an object A through pipes as shown in the above 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 14 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Cardboard surface?

Question 16 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Marble floor?

Question 17 :
When all the parallel rays reflected from a rough or irregular surface are not parallel, the reflection is known as ______________?

Question 18 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f303.jpg' /> Look at the above image. Can the image of the child in it be obtained on a screen?

Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07df59b460d7261f301.jpg' /> A small hole P is made in a piece of cardboard as shown in the above figure. The hole is illuminated by a torch. 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?

Question 20 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0faf59b460d7261f39f.PNG' /> Refer to the above figure. Can Boojho at C see the position of the image of an object situated at A in the plane mirror ?