Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb86f59b460d7261ec51.JPG' /> In the above figure, 4 is ____ in colour.

Question 2 :
In the case of mirrors that for different positions of the object the nature and size of the image change. Is it true for lenses also?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbebf59b460d7261eccd.jpg' /> A person takes a convex lens or magnifying glass and puts it in the path of sunrays. Then, he places a sheet of paper as shown in the figure. He adjusts the distance between the lens and the paper till he gets a bright spot on the paper. Now, he holds the lens and the paper in this position for a few minutes. Does the paper begin to burn?

Question 6 :
The image formed by a lens is always virtual, erect and smaller in size for an object kept at different positions in front of it. Identify the nature of the lens.

Question 9 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb89f59b460d7261ec54.JPG' /> In the above figure, 7 is ______ in colour.

Question 10 :
Image formed by a convex __________ is always virtual and smaller in size.

Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbecf59b460d7261ecce.jpg' /> A person takes a convex lens and fixes it on a stand. He places it on a table. Also, he places a lighted candle at a distance of about 50 cm from the lens as shown in the figure. The image of the candle is obtained on a paper screen placed on the other side of the lens. He moves the screen towards or away from the lens to get a sharp image of the flame. What kind of image will he get?

Question 13 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb8ff59b460d7261ec5c.JPG' /> In the above figure, what is the nature of the lens?

Question 15 :
Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are respectively :

Question 16 :
What type of lens is used as a spectacles to correct short sightedness?

Question 18 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb88f59b460d7261ec53.JPG' /> In the above figure, 6 is ______ in colour.

Question 20 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbe2f59b460d7261ecc0.jpg' /> A person stands in front of a plane mirror and looks at his image. Next, he raises his left hand. Which hand does the image raise as shown in the above figure?

Question 21 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbeef59b460d7261eccf.jpg' /> <img style='object-fit:contain' src='61cc1abe78c526e972caf046' /> A person takes a convex lens and fixes it on a stand. He places it on a table. Also, he places a lighted candle at a distance of about 50 cm from the lens as shown in the figure. The image of the candle is obtained on a paper screen placed on the other side of the lens. He moves the screen towards or away from the lens to get a sharp image of the flame. Will he get in any position of the object an image which was erect and magnified on a screen?

Question 22 :
In automobiles _______ mirror is used as Side mirror to get real view to see the traffic coming behind.

Question 23 :
_______ image is formed when the reflected rays actually meet and is obtained on a screen.

Question 27 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb84f59b460d7261ec4e.JPG' /> In the above figure, 1 is ____ in colour.

Question 28 :
Which one of the following is used as rear view mirror in cars and scooters?

Question 29 :
A virtual image larger than the object can be produced by a:

Question 30 :
An image formed by a concave ___ cannot be obtained on a screen.