Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0faf59b460d7261f3a0.PNG' /> Refer to the above figure. Boojho stands at A just on the side of a plane mirror as shown in figure. Can he see the image of objects situated at P, Q and R?

Question 3 :
Fill in the blanks: Night birds have ___________ cones than rods in their eyes.

Question 4 :
Which of the following statements is correct regarding rods and cones in the human eye?

Question 5 :
<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 6 :
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?

Question 7 :
<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 8 :
An interesting feature of a kaleidoscope is that you will never see the same pattern again. Is it TRUE OR FALSE?

Question 10 :
How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

Question 11 :
Fill in the blanks: The size of the pupil becomes__________ when you see in dim light.

Question 12 :
Which part of the eye gets affected if someone is suffering from cataract?

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 :
The size of the pupil becomes ______ when you see in dim light.

Question 15 :
In the iris, there is a small opening called the __________?

Question 16 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f302.jpg' /> In the above figure of the human eye, the cornea is represented by the letter

Question 17 :
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 18 :
When all the parallel rays reflected from a rough or irregular surface are not parallel, the reflection is known as ______________?

Question 19 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on White Chalk powder that is used in school?

Question 20 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on Polished wooden table?